It's nothing serious, but I encountered following behaviour using Q1 2008 beta RadControls for WinForms. I have startup form with two button. Both open another forms. When I load up application, default theme is used for these buttons. However, when I open any form using those two buttons and return back to the startup form, appearance of buttons changes. Below are pictures of both situations. You can see the difference therem
http://mf.ederon.net/telerik/form_before.png
http://mf.ederon.net/telerik/form_after.png
http://mf.ederon.net/telerik/form_before.png
http://mf.ederon.net/telerik/form_after.png