I'm stuck at 263 on both machines that are mining
Did you upgrade and reindex after the latest update?
I am on block 820
Looks like an invalid block at 263
>>> blockchain_list_forks
FORKED BLOCK FORKING BLOCK ID SIGNING DELEGATE TXN COUNT SIZE TIMESTAMP LATENCY VALID IN CURRENT CHAIN
--------------------------------------------------------------------------------------------------------------------------------------------------------------
262
00000239fd6da1f1bd74e03aa2e72772d3542064 Unknown Delegate 0 92 2014-11-28T22:29:12 7585 YES YES
0000145d9341af5f197986ac150fde2ab6fa59d4 Unknown Delegate 0 92 2014-11-28T22:28:33 7624 NO NO
REASONS FOR INVALID BLOCKS
0000145d9341af5f197986ac150fde2ab6fa59d4: 10 assert_exception: Assert Exception
block_data.difficulty() > difficulty:
{}
th_a chain_database.cpp:734 verify_header
{"block_data":{"previous":"0000011cd7c99672c63fbc835b3d1f5652b53a5a","version":0,"block_num":263,"timestamp":"2014-11-28T22:28:33","transaction_digest":"c8cf12fe3180ed901a58a0697a522f1217de72d04529bd255627a4ad6164f0f0","nonce":6092,"miner":"SPK7rYgHnMKDYHxuXnN129yVceGYxGgY6yu7","reserved":"","user_transactions":[]}}
th_a chain_database.cpp:742 verify_header
I am putting in some code to dampen the difficulty adjustment because it appears to be swinging back and forth too much. The hard fork will happen on block 10,000 (at ~850 now). I am also about to release a client that will mine 4x faster (multi-threaded).