I'm having the same problems with both the latest 1.5 release and the latest 2.0 beta release in VS.NET 2003. When accessing the Resharper options or performing any action which results in something being "drawn" in the IDE (for example, ctrlN to display the navigate to type dialog, or ctrlspace to bring up intellisense), I get lots of pop-ups with "Invalid Operation Exception - object is in use elsewhere". This seems to only happen on very large solutions (> 50 projects). Also, when I have a C# file open, the bar to the right of the scroll-bar that usually displays tick-marks for errors/warnings in the file does not render correctly. It contains garbage when I first open a file. If I drag another window over it to force a redraw, it sometimes corrects itself, but only temporarily.
I have tried uninstalling and reinstalling Resharper (both versions), resetting all my shortcuts, deleting everything I can find on my computer that contains "Resharper" or "Jetbrains", deleting solution option files (.suo's), yet the problems persist. Any suggestions?