This sticky thread lists known issues and breaking changes introduced in the UI for ASP.NET AJAX releases.

• Q3 2011 (Version number: 2011.3.1115)
• Q1 2013 (Version number: 2013.1.220)
• Q2 2013 (Version number: 2013.2.611)
• Q2 2013 SP1 (Version number: 2013.2.717)
• Q3 2013 (Version number: 2013.3.1015)
• Q1 2014 (Version number: 2014.1.225)
• Q2 2014 (Version number: 2014.2.618)
• Q3 2014 (Version number: 2014.3.1024)
• Q1 2015 (Version number: 2015.1.225)
• Q2 2015 (Version number 2015.1.623)
  
• Q2 2015 SP1 (Version number: 2015.2.729)
• Q3 2015 SP1 (Version number: 2015.3.1111)
• Q1 2016 (Version number: 2016.1.113)
• Q1 2016 SP1 (Version number: 2016.1.225)
• R2 2016 (Version number: 2016.2.504)
• R2 2016 SP1 (Version number: 2016.2.607)
• R3 2016 (Version number: 2016.3.914)
• R3 2016 SP1 (Version number: 2016.3.1018) 
• R1 2017 (Version number: 2017.1.118)
• R1 2017 SP1 (Version number: 2017.1.228)
• R2 2017 (Version number: 2017.2.503)
• R2 2017 SP2 (Version number: 2017.2.711)
• R3 2017 (Version number: 2017.3.913)
• R1 2018 (Version number: 2018.1.117)
• R2 2018 (Version number: 2018.2.516)
• R2 2018 SP1 (Version number: 2018.2.710)
• R3 2018 (Version number 2018.3.910)
• R1 2019 (Version number: 2019.1.115)
• R3 2019 (Version number: 2019.3.916)
• R1 2020 (Version number: 2020.1.114)
• R3 2020 SP1 (Version number: 2020.3.1021)
• R1 2021 SP1 (Version number: 2021.1.224)
• R2 2021 (Version number: 2021.2.511)
• R2 2021 SP1 (Version number: 2021.2.616)
• R3 2021 (Version number: 2021.3.914)
• R3 2021 SP1 (Version number: 2021.3.1111)
• R2 2022 SP1 (Version number: 2022.2.622)
• R3 2022 (Version number: 2022.3.913)
• R1 2023 (Version number: 2023.1.314)
• 2024 Q1 (Version number: 2024.1.131)
• 2024 Q3 (Version number: 2024.3.805)
• 2024 Q4 (Version number: 2024.4.1113)
• 2024 Q4 (Version number: 2024.4.1114)
• 2025 Q1 (Version number: 2025.1.211)
• 2025 Q2 (Version number: 2025.2.520)
• 2025 Q3 (Version number: 2025.3.825)
  

Q3 2011 (Version number: 2011.3.1115)

Problem: When adding items to OData-enabled controls (RadMenu, RadTreeView, RadListBox, RadComboBox) through design time erroneous markup is applied to the control:

<telerik:RadListBox runat="server" ID="RadListBox1">
    <Items>
    </Items>
    <WebServiceSettings>
        <ODataSettings InitialContainerName="">
        </ODataSettings>
    </WebServiceSettings>
</telerik:RadListBox>

Please note the added ODataSettings section. It will cause JavaScript errors on the page.

When I run my project I'm getting this error

Could not load file or assembly 'Telerik.Web.UI' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)

In my web.config I checked that the version in the web.config is the same as the version I'm using in references

<assemblyIdentity name="Telerik.Web.UI" publicKeyToken="121fae78165ba3d4" culture="neutral" />
        <bindingRedirect oldVersion="0.0.0.0-2020.2.617.45" newVersion="2020.2.617.45" />

I cannot seem toe get my XAxis right with the following code, I simply want to display whole hours on the X-axis and values coming from a dataset like so

0 2025-10-22 00:31:16.000
0 2025-10-22 00:31:46.000
0 2025-10-22 00:32:16.000
0 2025-10-22 00:32:46.000
0 2025-10-22 00:33:16.000
18 2025-10-22 00:33:46.000
1591 2025-10-22 00:34:16.000
1584 2025-10-22 00:34:46.000
1585 2025-10-22 00:35:16.000
1589 2025-10-22 00:35:46.000
1585 2025-10-22 00:36:16.000
0 2025-10-22 00:36:46.000
0 2025-10-22 00:37:16.000
0 2025-10-22 00:37:46.000
0 2025-10-22 00:38:16.000
0 2025-10-22 00:38:46.000
0 2025-10-22 00:39:16.000
0 2025-10-22 00:39:46.000
0 2025-10-22 00:40:16.000
0 2025-10-22 00:40:46.000

.

 <XAxis DataLabelsField="datum" Type="Category" Name="category" AxisCrossingValue="0" Color="black" BaseUnit="Hours" BaseUnitStep="1">
    <LabelsAppearance Visible="true" RotationAngle="45">
     </LabelsAppearance>

This produces the XAxis as shown in the attached screenshot.

What is the way to go?

Greetings,

I have noticed today that the following demo pages are broken when using the latest versions of Chrome & Edge:

https://demos.telerik.com/aspnet-ajax/htmlchart/examples/appearance/configuringappearance/defaultcs.aspx

https://demos.telerik.com/aspnet-ajax/htmlchart/examples/functionality/dateaxis/defaultcs.aspx

https://demos.telerik.com/aspnet-ajax/htmlchart/examples/functionality/multiline-labels/defaultcs.aspx

https://demos.telerik.com/aspnet-ajax/htmlchart/examples/functionality/pan-zoom/defaultcs.aspx

Each of these have a series of JavaScript errors that prevent the page from working:

RadHtmlChart.js:79 Uncaught SyntaxError: Invalid or unexpected token
    at b.RadHtmlChart._parseObject (RadHtmlChart.js:79:46)
    at b.RadHtmlChart._configurePlotArea (RadHtmlChart.js:128:47)
    at b.RadHtmlChart._getMainConfig (RadHtmlChart.js:96:20)
    at b.RadHtmlChart._getChartConfig (RadHtmlChart.js:82:3)
    at b.RadHtmlChart._createStandardChart (RadHtmlChart.js:74:57)
    at b.RadHtmlChart.createChart (RadHtmlChart.js:59:3)
    at b.RadHtmlChart._initialize (RadHtmlChart.js:40:3)
    at b.RadHtmlChart.initialize (RadHtmlChart.js:34:7)
    at b.RadHtmlChart.endUpdate (Telerik.Web.UI.WebResource.axd?_TSM_HiddenField_=ctl00_QsfScriptManager_TSM&compress=1&_TSM_CombinedScripts_=%3b%3bSystem.Web.Extensions%2c+Version%3d4.0.0.0%2c+Culture%3dneutral%2c+PublicKeyToken%3d31bf3856ad364e35%3aen-US%3a5bc44d53-7cae-4d56-af98-205692fecf1f%3aea597d4b%3ab25378d2:6:53689)
    at Sys.Component.create (Telerik.Web.UI.WebResource.axd?_TSM_HiddenField_=ctl00_QsfScriptManager_TSM&compress=1&_TSM_CombinedScripts_=%3b%3bSystem.Web.Extensions%2c+Version%3d4.0.0.0%2c+Culture%3dneutral%2c+PublicKeyToken%3d31bf3856ad364e35%3aen-US%3a5bc44d53-7cae-4d56-af98-205692fecf1f%3aea597d4b%3ab25378d2:6:55151)

Hope this helps ....

Hello Telerik Team,

Our customers identified a few accessibility concerns related to the RadEditor Image Manager and Document Manager popup windows:

1. Keyboard Focus on Popup Activation
   When a user tabs to the Image Manager plugin and presses Enter, the popup window opens. However, keyboard focus does not automatically move into the popup. Instead, the user must press the Tab key again to shift focus manually.
   ➤ To meet accessibility standards, focus should move directly into the modal or popup when it appears. This ensures that keyboard and screen reader users can interact with the dialog immediately without navigating through background content.
2. Missing Dialog Roles and Labels
   The dialog containers ( see below ) currently lack appropriate accessibility roles.
   ➤ Each dialog container should include role="dialog".
   ➤ If the dialog has a visible title, it should also include aria-labelledby referencing the ID of that title element. This allows assistive technologies to announce the dialog context clearly.

Is there any way to fix these two issues?

Thanks,

Lan

Hi,

I am new to the Telerik, I have big story to ask, first I installed the Version=2016.1.113.35 on my Local machine, and started using the application everything was working good, before that I had different Version=2015.2.623.45 of Telerik on the same machine on top  of it I installed the current Version=2016.1.113.35. But when I deployed it on the Server, and server has the older version= 2015.2.623.45 that I had on my machine. And on the Server Telerik controls stopped working like RadEditor was completely disabled. 

Then I did some crazy mistake, I tried to manually copy the dlls of the same Version from Server and added them in to References thinking that this will work as backward compatibility would exist. Now it started giving me different Compilation errors. I am little frustrated can somebody please help me in this regards.

 My errors are as below:

<pre>

Unable to resolve type 'Telerik.Web.UI.RadAjaxLoadingPanel, Telerik.Web.UI, Version=2016.1.113.35, Culture=neutral, PublicKeyToken=121fae78165ba3d4'

Unable to resolve type 'Telerik.Web.UI.RadTextBox, Telerik.Web.UI, Version=2016.1.113.35, Culture=neutral, PublicKeyToken=121fae78165ba3d4'
Unable to resolve type 'Telerik.Web.UI.RadMaskedTextBox, Telerik.Web.UI, Version=2016.1.113.35, Culture=neutral, PublicKeyToken=121fae78165ba3d4'
Unable to resolve type 'Telerik.Web.UI.RadAutoCompleteBox, Telerik.Web.UI, Version=2016.1.113.35, Culture=neutral, PublicKeyToken=121fae78165ba3d4'
Unable to resolve type 'Telerik.Web.UI.RadAjaxManager, Telerik.Web.UI, Version=2016.1.113.35, Culture=neutral, PublicKeyToken=121fae78165ba3d4'

</pre>

And my Web Config is as below any help please?

<PRE>

<remove name="Telerik_Web_UI_SpellCheckHandler_axd" />
<remove name="Telerik_Web_UI_DialogHandler_aspx" />
<remove name="Telerik_RadUploadProgressHandler_ashx" />
<remove name="Telerik_Web_UI_WebResource_axd" /><add name="Telerik_Web_UI_WebResource_axd" path="Telerik.Web.UI.WebResource.axd" type="Telerik.Web.UI.WebResource" verb="*" preCondition="integratedMode,runtimeVersionv2.0" />
<add name="Telerik_Web_UI_DialogHandler_aspx" path="Telerik.Web.UI.DialogHandler.aspx" type="Telerik.Web.UI.DialogHandler" verb="*" preCondition="integratedMode,runtimeVersionv2.0" />
<add name="Telerik_Web_UI_SpellCheckHandler_axd" path="Telerik.Web.UI.SpellCheckHandler.axd" type="Telerik.Web.UI.SpellCheckHandler" verb="*" preCondition="integratedMode,runtimeVersionv2.0" />
<add name="ScriptHandlerFactory" verb="*" path="*.asmx" preCondition="integratedMode" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
<add name="ScriptHandlerFactoryAppServices" verb="*" path="*_AppService.axd" preCondition="integratedMode" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
<add name="ScriptResource" preCondition="integratedMode" verb="GET,HEAD" path="ScriptResource.axd" type="System.Web.Handlers.ScriptResourceHandler, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
<add name="ChartImage_axd" path="ChartImage.axd" type="Telerik.Web.UI.ChartHttpHandler" verb="*" preCondition="integratedMode,runtimeVersionv2.0" />
<add name="Telerik_RadUploadProgressHandler_ashx" path="Telerik.RadUploadProgressHandler.ashx" type="Telerik.Web.UI.RadUploadProgressHandler" verb="*" preCondition="integratedMode,runtimeVersionv2.0" />

</PRE>

I Upgraded from ASP.net AJAX perpetual license to Dev Complete subscription and am running into ASP.NET AJAX License Error Banner & Watermarks issue. I have tried several approaches, but unable to solve the issue.

• Running a Web Application that is set to .net 4.7.2
• I installed Telerik 2025.3.825.462 and Telerik.Licensing.Runtime
• Copied the License vb script for UI for ASP.NET AJAX and pasted to top of assemblInfo.vb, the rebuild the project.
• I still get the banner. I have also tried copying the license.txt file to AppData\Roaming\telerik
• Also tried to Copy the VB code snippet into a new file, for example, TelerikLicense.vb and add to my project.
• I have tried removing .bin and .obj folders then rebuilding

Nothing is working. One odd thing I did notice is my VB Script License Key has 2 Assembly: Telerik.Licensing.EvidenceAttribute entries. In all of the Tutorial videos I have watched they only have 1 Assembly Entry.  Could one of these entries be my old perpetual license? Please advise what other steps I can try to troubleshoot.  

On my pageI have a RadGrid with columns containing gross and net ammounts  and a RadButton "Gross/Net". By clicking the button the grid shows it columns accordingly. Worked liek a charm.

Then I added aggregates od type "Sum" and still everything worked fine.

After that I added an aggregate od type "Custom" to one of the columns (which calculates  and shows everything as it should) but than I lost the button funcionality, clicking it does not switch the columns visibility. 

The button does:  myGrid.MasterTableView.GetColumn("mycolumn").Display = Not mybutton.Checked.
Also tried:  myGrid.MasterTableView.GetColumn("mycolumn").Visible = Not mybutton.Checked

When I attempt to add a rad grid to a page I am getting this error every time.  This is noew as I use grids all the time.

This is just added and no functionality is yet attached to the grid.

Hello Telerik team,

Our customer reported that the Telerik RadEditor table plugin is not accessible using the keyboard. I tested it on the RadEditor demo page and confirmed the same issue. Is there any solution for this?

Thanks in advance,

Lan