New to this forum and frankly didn't find any appropriate place for my thread, so here it goes:
We use Sitecore 7.2 CMS with MVC and use the included Rich text editor (I assume that is RadEditor).
One of our test environments suffers from not being able to open the rich text editor, with every click on "Show Editor" resulting in a messed up layout of the editor dialog: ......Paragraph Style .... . Design . HTML (textarea in "Design" view missing).
The console in every browser reports: Uncaught SyntaxError: Unexpected token < on line 1 of WebResource.axd
Now, opening the WebResource link from console brings up this message:
Go back to site
An unexpected error has occurred.
Troubleshoot issues with Windows SharePoint Services.
On the recommendation from Sitecore Support, we went through every step in this documentation about Web Resources Troubleshooting
Sitecore Support had access to the site and claims the issue must be with Telerik logic, and as such, they can't help us any more and referred to bring up the topic in Telerik Forums.
This specific test environment is seemingly identical to others in regards to IIS settings, file and folder permissions, network access, even installed software.
I can provide screen shots or screen casts or logs and other forms of documentation if needed, even direct access to this test environment.