Can anyone tell me where Studio keeps the list of the TMs that are currently open in the 'Translation memories' view?

We faced the problem that one of the TMs we opened is corrupt and Studio keeps displaying the error message "The data file is corrupt". It does this repeatedly so that we cannot work in Studio anymore. 
I checked the entries in UserSettings and there is no reference to any TM there. I even deleted the UserSettings file, but Studio keeps trying to open this corrupted TM.

Even a repair of Studio did not solve the problem.

Where from does Studio take the information that it should open this TM in the 'Translation Memories' view?

Any hint on how to solve this nasty problem is welcomed.
Walter