Thanks scook, I'm running Windows 7 Home Premium - where do I find this setting?
Also, X2 about says "build 306" - is this the same as X2a? I'm pretty sure my Sonar is up to date...
edit:
OK, just ran the X2a patch - I reinstalled X2 a while ago, guess I forgot to run the patch. For now, it seems to have fixed this problem, but it was always intermittent, so we'll see.
Thanks for the heads up!