Half the pools I go to are stuck on block 793 and not finding anymore blocks, while other pools I go to are working on block 802 and seem to be finding blocks fine....
all my 3 wallets on 3 machines, 1.2.1 are having problems with a block, however it seems like they are only printing out an exception and then continuing to work. the printout :
2015-01-25 19:43:08 INFO: get timestamp for tx with id -4762078490203704075 found
nxt.at.AT_Exception: Calculated md5 and recieved md5 are not matching
at nxt.at.AT_Controller.validateATs(AT_Controller.java:404)
at nxt.BlockchainProcessorImpl.accept(BlockchainProcessorImpl.java:682)
at nxt.BlockchainProcessorImpl.pushBlock(BlockchainProcessorImpl.java:647)
at nxt.BlockchainProcessorImpl.access$400(BlockchainProcessorImpl.java:51)
at nxt.BlockchainProcessorImpl$1.processFork(BlockchainProcessorImpl.java:323)
at nxt.BlockchainProcessorImpl$1.run(BlockchainProcessorImpl.java:191)
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at java.util.concurrent.FutureTask.runAndReset(Unknown Source)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(Unknown Source)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
2015-01-25 19:43:09 INFO: tx with id -4762078490203704075 found
2015-01-25 19:43:09 INFO: get timestamp for tx with id -4762078490203704075 found
it seems the problem started somewhere between block 59761 and 59771
all 3 wallets on all 3 different machines give the same error. i would assume something got in via the network, that the software stumbles upon.
That error was caused from a miner that had outdated version. If you restart the wallets you probably will be good