Ummphh! What a mess. I've never seen anything like this. It just makes no sense that saving a file doesn't save somewhere...and then doesn't tell you it's not going to! Vista's loaded with pop-ups and non-descriptive error messages.Hopefully, all goes well with the reinstall. And sorry I couldn't be of more help. I can usually figure out this stuff but I'm really at a loss here.Regards,Jim Karn

Well I've finally fixed it. I uninstalled FSX, and then made sure that all components of it were gone. It seems that the regular uninstall tool does not actually manage to clear all the SP2 components so I had to use the MS Install clean up tool instead. I also redirected my Documents folder back to the default path. I reinstalled FSX, and what do you know - it all works as intended now.Thanks for all your help.