List of recent Lightroom Catalogs not showing in the dialog at launch

Question

I have a friend using Lightroom 3 on a Windows 7 PC. She uses multiple catalogs. (one for each client) as do I.
Now when she launches LR the list of recent catalogs is empty. Could this be cleared some where? Why do they not show up and  will they start showing up again after she opens different catalogs?
Thanks for any feedback.

Answer 1

If LR uses the Windows recent-files facility, and I’m not saying it does, then clearing recent documents in another area of Windows might have cleared LR’s too.    A question back to her would be whether other recent-documents lists have disappeared or only the LR-catalog recent list.  The recent-files would be user-profile specific, too, I think, so logging in with a different user would make things look different. 
If the LR recent-library-list is something internal to LR and unrelated to the OS, then it could be part of the preferences, and if she reset preferences for any reason, then that might have cleared the catalog list.
If this is on a Mac, then I’m not sure, but I’d expect the OS has a recently-opened-files facility, too, and that such things are tied to the user.
Unless there is some permission problem or corruption that has caused them to disappear, they probably should start showing up, again.  It’d be easy enough for her to check, just open LR and open a catalog, then close LR and open LR, again and see if the just-opened catalog shows in the list.  If so then there’s probably nothing more to do, except not do whatever cleared the list in the first place, where we can’t really know what she did since we weren’t there.