We use WSS 3.0 SP1 only not MOSS.
We have successfully installed and used RadEditor for MOSS 4.5.1 for couple months. We then tried to install RadEditor for MOSS 5.0.1 following precisely the installation instructions (ASP.NET AJAX Extensions 1.0 then the RadEditor Solution).
We had no problem using "Telerik RadEditor for MOSS" Web Part, but we could not make it work in List Items.
We made sure to log as an administrator when we enabled the Features, so that the TelerikRadEditor.ascx gets copied to 12\TEMPLATE\CONTROLTEMPLATES folder as explained here, and we checked: it was successfully copied.
However, we still had WSS default Rich text Editor.
The Sharepoint Log file gave me a clue : "Load control template file /_controltemplates/TelerikRadEditor.ascx failed: Could not load file or assembly 'Microsoft.SharePoint.Publishing, Version=126.96.36.199, Culture=neutral, PublicKeyToken=71e9bce111e9429c' or one of its dependencies. The system cannot find the file specified. "
'Microsoft.SharePoint.Publishing' is not a WSS Assembly, so TelerikRadEditor.ascx, used in List Items cannot work as is on WSS!
I manually edited the \TEMPLATE\CONTROLTEMPLATES TelerikRadEditor.ascx to remove the reference to this assembly and removed :
|<%@ Register TagPrefix="CMS" Assembly="Microsoft.SharePoint.Publishing,...
and removed the control which was using the CMS reference :
|<div id="originalEditorContainer" runat="server">
| <CMS:HtmlEditor ID="RichHtmlField" runat="server" />
and the control now works on List Items.
Is this a safe change? Thanks Telerik for your prompt reply.