I'm using the current release of RStudio (1.2.1335) on Windows 7. In general it seems fine. However, after resume from standby, the main window appears completely blank. Interestingly, the buttons and menus within the UI are still there, since I can open the menu by clicking in the appropriate place. I've tried using the diagnostics menu to reload the UI, but nothing happens. I've also tried restarting R.