This is a strange issue that should not be occurring. Could you try another skin to see if the problem is isolated to the office2010Silver one? It seems to me that, for some reason, the image sprite that creates the titlebar of the radwindows does not load for this skin in your project. Also, it is possible that your project has simply hit the 31 stylesheet limit IE has, so this could be OK with other browsers.
I would advise that you examine the following resources:
If the problem is with that specific resource failing to load (monitoring the network traffic for broken requests and the last blog post can determine if this is the case) can mean that either something is breaking in the server, or that the skins assembly is somehow corrupt. Here is what I would suggest you try:
- clear the ASP and browser caches, reset the IIS (or at least recycle the app pool), then fully load the page again (ctrl+f5 usually) and see if this fixes the problem
- choose another of the gray-themed skins, e.g. Default, Silk
- if not, try downloading the Skins assembly again from our site and replace the existing one with it
- if all else fails - try the skins CDN we have so that these resources are not loaded from your server: http://www.telerik.com/help/aspnet-ajax/stylesheetmanager-cdn-support.html
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