We cannot reproduce this problem and are out of ideas as to what is causing this error. We have trying stopping the Themes service, played with every VisualStyle setting in Visual Studio. So we know it has to be coming from setting on your machine. So here are some questions:
Any other options you can give us would be helpful. There is nothing we can do until we can reproduce this error. It is our policy to reproduce an error rather than to attempt to blindly create a fix.