hi
same issue here... since 2 days bitcoin-qt tells me to rebuild the blockchain. the client makes it and after some time the client was in sync.
now i make the update but the same error on startup, but with the new client no syncing anymore
in the debug console this is what i get on get info:
{
"version" : 80500,
"protocolversion" : 70001,
"walletversion" : 60000,
"balance" : ******,
"blocks" : 0,
"timeoffset" : 0,
"connections" : 17,
"proxy" : "",
"difficulty" : 1.00000000,
"testnet" : false,
"keypoololdest" : 1378389433,
"keypoolsize" : 100,
"paytxfee" : 0.00000000,
"unlocked_until" : 0,
"errors" : "Warnung: Angezeigte Transaktionen sind evtl. nicht korrekt! Sie oder die anderen Knoten müssen unter Umständen (den Client) aktualisieren."
}