I got the same problems with my BNs:

^{2015-12-14 11:25:38 UpdateTip: new best=000eec7c4c1fd2c1d488dc74d7ac80fa8829a41d3c02c01dae8ac2c87e11970a  height=266996  log2_work=35.947744  tx=276481  date=2015-12-13 20:31:37 progress=0.991034  cache=2583
2015-12-14 11:25:38 ERROR: ConnectBlock(): coinbase key detected in last 40 blocks
2015-12-14 11:25:38 Misbehaving: 91.230.123.86:8877 (0 -> 100) BAN THRESHOLD EXCEEDED
2015-12-14 11:25:38 InvalidChainFound: invalid block=000944bcc77a8e9a81a4b3fc673dda17627830dd1a03bae35c974e580831cc9c  height=266997  log2_work=35.947744}


lg t.