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RadRadialGauge no longer rendering after years of use - maybe due to Windows/IE updates?

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Ryan
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Ryan asked on 14 Feb 2019, 06:42 PM

Windows 7 Enterprise - IE 11 (Version 11.0.9600.19236)
VS 2012 - .NET Framework 3.5
Telerik UI For ASP.NET AJAX 2016.2.607.305

We've been using the RadRadialGauge control in our intranet web application for years since around 2016 with no issues.  Just recently (not sure exactly when) our users started noticing that the control was no longer displaying, just completely blank (see attachment 3-RadRadialGauge_Missing.jpg).  After some analyzing & testing I've determined it doesn't seem to be a licensing or server-side issue. 

To come to this conclusion I decided to try the RadLabel control which is just textual & has no graphic rendering like RadRadialGauge (see attachment 1-RadLabel.jpg).  It appears fine since it's only displaying text.

Next I tried RadDatePicker which has a combination of text & graphic rendering (see attachment 2-RadDatePicker.jpg).  It resulted in sort of a hybrid display where the date input box is there, but instead of showing the calendar icon it just has the mouse hover text.

It should be noted throughout this process I also tried downloading the latest version of these controls (2019.1.115.35) but still experienced the same behavior.  I'm theorizing these problems are due to a Windows or more likely IE update which we might have recently received.  All software updates like this are managed at the Enterprise level & pushed to all users in our company.  I've tried searching the forums & I see here & there somewhat similar rendering issues posted, but nothing so far which has resolved my particular issue.

Any help would be greatly appreciated!

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Ryan
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answered on 14 Feb 2019, 07:12 PM
I should have also mentioned due to application requirements we utilize IE Compatibility View settings to emulate "Quirks Mode" (Document mode - 5 (Default)).  But we've done that from the beginning & have had no problem using the RadRadialGauge control until now.
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Peter Milchev
Telerik team
answered on 18 Feb 2019, 05:05 PM
Hello Ryan,

It seems to be an issue introduced in the Security Update for Internet Explorer and Microsoft are aware of it and are looking into it: https://support.microsoft.com/en-us/help/4486474/cumulative-security-update-for-internet-explorer-february-12-2019

Issue: After you install this security update, Internet Explorer may not load images that have a backslash (\) in their relative source path. 

SolutionChange the backslash (\) to a forward slash (/) in the relative path of the image element. 

Or:

Change the relative path to a full URL path. 
Microsoft is working on a resolution and will provide an update in an upcoming release. 


This issue should be resolved once Microsoft fixes their regression in one of their upcoming releases.

Regards,
Peter Milchev
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Ryan
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answered on 19 Feb 2019, 02:37 PM

Ok well at least it's good to know there seems to be a definitive reason for this.  Few more questions on this:

1) Have other Telerik customers reported the same behavior which is connected to this Microsoft IE security update?

2) Where I've implemented usage of the RadRadialGauge there's no explicit path set for images (it's obviously internal to the control) so is there nothing else I can do from my end to resolve this?

3) Is Telerik taking any action in the meantime to resolve this issue since my controls have completely disappeared or can I assume I need to wait for Microsoft to provide the resolution they're working on?

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Peter Milchev
Telerik team
answered on 20 Feb 2019, 09:55 AM
Hello Ryan,

It seems that Microsoft released a fix for this issue. Would you please install the following updated and check if the issue is resolved? 
Regards,
Peter Milchev
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Ryan
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answered on 20 Feb 2019, 06:08 PM

I installed KB4491113 but it had no effect. I figured this would be the result because after inspecting Windows Update from Control Panel I confirmed that I had never received the original KB4486474 which you had suggested was the original cause of my issue. So installing the "fix" to the bug would make no change.

So back to the beginning. I've also subsequently tested the same functionality in Chrome & Firefox locally on my machine (both supported according to your site) & experienced the same behavior where the RadRadialGauge control just doesn't display. This further proves it wasn't due to an IE update as other browsers are having the same issue. So what else can I try or test to get around this problem?

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Peter Milchev
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