I have archived the old block chain etc and here is the last block from debug.log:

03/13/14 21:23:56 received block 00000000693c85858ae0
03/13/14 21:23:56 SetBestChain: new best=00000000693c85858ae0  height=322480  tr
ust=34413680427  date=03/13/14 21:23:44
03/13/14 21:23:56 ProcessBlock: ACCEPTED

The old client was 1.0.2.

What I did was to delete the old block chain and download again...
The wallet seems to have the same amount now, but doesn't seem to initiate any PoS

So are you saying we might have an incompatible fork now?

EDIT: I have successfully updated some 1.0.3 wallets to 1.0.4, so it might be some issue with 1.0.2 to 1.0.4? Neither wallet does PoS now, even though they have coins since December 2013 in there.