While developing some user controls in Silverlight I have come with a situation,
for example when dragging a Chart control in the Visual Studio 2010 designer where I get something like:
Error HRESULT E_FAIL has been returned from a call to a COM component
I have been looking for a solution but have not found anything yet.
The only workaround has been:
a) Close all windows. Do a Clean and a Rebuild or Close Visual Studio and open it again.