Are you running the beta version? There was an issue a couple of beta versions back. I had to uninstall and reinstall on that occasion. Gary thought he had fixed it in the latest version, maybe he missed something? There is a zip file you can download from the site that you can use to replace files in the folder where VA lives. That might be an option to look at. If you are going to upgrade/reinstall, I recommend you take a copy of the data file with your profiles in it. I would say back them up, but that means VA needs to run first.
If none of those work, you are in Gary's hands from that point forward!
Regards,
Slan