TedGamble

JcRabbit, you nailed it!!! Logitech Setpoint was running. Exiting Setpoint fixed the problem. This was happening on two x64 machines, both running Setpoint. Then, when I restarted Setpoint, within 10 seconds I got the blank boxes again. Thanks for your hint, although I'm not sure I like the fix...

Object Dock Plus 2.0 running on 64-bit Win7 Ultimate, on 2 different machines. Same behavior on both machines. Tabbed Dock looks normal, then turns into big blank rectangle. You can change the theme using the Settings dialog and it resumes it's correct appearance, but within a minute goes blank again. This is a brand new installation downloaded yesterday.