Happens with Win8 and VS2012 themes, but not with the Office themes only with form's top left and right corners. If the mouse is moved into the corner from the center of the form. From this cursor position, the form cannot be resized. From this position, once a resize is attempted, repositioning the mouse and retrying the resize may not work at all.
Hi Mark, we haven't fix this issue yet. We were working on items with higher priority. Make sure you click the Like button in order to cast your vote for this case.
Is there a fix for this? It was reported a long time ago: http://www.telerik.com/forums/trouble-resizing-radform-with-mouse