It looks strange. Could you provide more details what options do you use to start the wallet. Thank you.
i had to clean up ~/.Grain folder
btw all my coins are gone
{
"account" : "",
"category" : "orphan",
"amount" : 761.50000000,
"confirmations" : 0,
"generated" : true,
"txid" : "79992ac9127644b1f9060e625f65fd36ab194f46e76b6f51d079278228e150c5",
"time" : 1401408127,
"timereceived" : 1401408176
},
I am sorry for this, but most likely this block have been mined while the wallet was on fork, not on main chain.
Nevertheless, try to start the wallet with option '-repairwallet'