In the data folder you have to files named Models
one is MODELS.lst and the other is MODELS.vghd
the file MODELS.lst is the Inventory list of What is on your HD.
this is the file that is rebuilt by doing a Rebuild Collection.
the file MODELS.vghd is your Rights. It comes from the server
and has all of the rights to allow you to play the cards you have purchased.
this is updated when you Synchronize with the server
If either one of the files are corrupt or missing,
your collection will be displayed all Gray, or No cards will be displayed at all..
the Model files are still on your HDD.
but the Inventory or Rights are missing..
you have to
Synchronize with the server
and then rebuild your collection.
All Gray = lost inventory file - do a Rebuild Collection
No Cards = Lost rights file - Synchronize with Servers, then Rebuild collection.
if neither works. Chances are, you're not able to connect to the Serves.
Quit, Shut down PC, reboot Router, restart PC, and then try it again