One easy thing to do for you guys is, from the "Help" menu, Debug items, Check DLL Versions.
Paste the results here, then we can see if there is some kind of a DLL Conflict that could cause this.
As I said, I run Vista 64bit, and I have no issues at all, and I have another Vista 32bit machine, again, no problems at all, so I dont suspect it is the program, but something else interfering, or a DLL Conflict.