Are you using the latest client? Do you have multiple (copied) wallets? Can you write the exact text on the line 0/unconfirmed or 0/.... ?
I am using Bitcoin version 0.3.22-beta
Does version matter?
I have two copies, one in a computer, one in a flash drive. Both encrypted with TruCrypt.
The exact text is:
0/unconfirmed 7/19/2011 22:25