The first warning is for a web resource (requested through WebResource.axd) that has not been compressed. The rest of the resources, those requested through Telerik.Web.UI.WebResource.axd are compressed because our handler does so. In order to compress the first type of resource you can use RadCompression
specifically configured to catch WebResource.axds or configure your web server manually.
The second case is more curious. Our controls output only the CSS files, which they require; otherwise they will not be displayed properly. So I am not sure why the warning is raised.
Could you please provide more information about the second case, e.g. which are the controls on the page having the warning and what is the response returned by the handler? Alternatively you can stop style sheet combining in RadStyleSheetManager (EnableStyleSheetCombine=false) and detect which exactly resources are raising the warning and again inspecting their response.
the Telerik team