Sounds like a job for Rebuild Collection. Go into your Tools section, (the cog wheel at top right). Then look towards the top left and click on Rebuild collection. (Click on Advanced settings first). This should fix your issue @781 :)
For the others, are you all using Vista?
The general rule here is to download and OVERwrite previous installs rather than uninstall old ones first. I can honestly say I've NEVER had an issue installing each and every new version for the last 5 or 6 years except one time, I had to uninstall and, probably my fault, screwed everything up :(
My cards disappeared etc.
So... a suggestion that might work for you guys. From the VGHD website, if you don't have the installer already saved, download and install version 1.2.0.84 again. I know it has been disabled since the end of June but bear with me, please :) Now come back and download the latest version, 1.2.126 and just install over your old one WITHOUT uninstalling anything. I'm going to test this right now and get back to you in a few mins ;)...
Ok. Sorry, the VGHD website now re-directs to the latest download version. 1.2.126. I Still have the installer for .84 and it will install and run but there are no demos and you can't buy cards. I don't want to break any rules here but I could upload the .84 installer to Google Drive and post a link here.
Peeps having issues in this way could then download and install then should be able to upgrade as the rest of us have done :)
Need an ok from a Mod or Team member first tho ...