Proof of stake lost

We recently updated one of our daemons to version 0.4. First it was complaining about that addr.dat was broken. When creating a new addr.dat (moving the old to addr.dat.bak) the daemon was starting.

But it does not show any proof-of-stake coins. Looking up a single proof-of-stake mining transaction is say generated but still the amount is not shown, when performing “getinfo”.

Can you give me any hints what I have to do to get this balance back?