Make sure to upgrade your client to the latest version before sending or accepting any trades after block 12096.
For those who want to connect to updated nodes you can addnode=94.23.215.174 which is in turn connected to 3 of my other updated nodes (all with a high max connections). I'm saying that because we had trouble propagating some transactions, and you want them to reach the miners on the right chain.
with new client i start getting this while solo minging
received block 00002063543d6cfef6d6edd6a71fc6274a5d84fcb572c970d5ca5dcf2cbf4a04
nActualTimespan = 152615 before bounds
GetNextWorkRequired RETARGET
nTargetTimespan = 1209600 nActualTimespan = 152615
Before: 1f00fff0 0000fff000000000000000000000000000000000000000000000000000000000
After: 1e204aa5 0000204aa5555555555555555555555555555555555555555555555555555555
ERROR: AcceptBlock() : incorrect proof of work
ERROR: ProcessBlock() : AcceptBlock FAILED