Thank you for the quick answer. Should then the longest blockchain win and take over automatically, or there are also sync issues in the network?
Before that accident, i thought that standard wallet automatically choose longest blockchain. But now i remembered accident in bitcoin network (when max block size was increased and not all nodes accepted it), and albeit older-version-client chain was longer, Gavin needed to use "dev-key" and personal contacts with pool admins to fix fork. Pools at those time downgraded to older version.
Yes, if I remember correctly they have moved back to version 0.7.
Are there any nodes from the new blockchain in order to try to sync?