Around 2015-10-14T19:21:39 dele-puppy attempted to claim a vesting balance (his witness pay) and as a result the network split 60/40 because 40% of the witnesses thought the transaction was invalid.
As a result the last irreversible block hung around block 33845 (the block prior to the one that forked the network). The blockchain grew to 269 blocks before 2/3's of the witnesses managed to agree and extend the last irreversible block back to the typical 20 to 30 behind the head block number.
In this situation everyone on the network was accurately reporting the state and the user interfaces indicated to the users that their operations were pending confirmation. Any / all exchanges following the last irreversible block would have been OK.
We have determined the cause is due to some non-deterministic behavior in witness pay that resolves itself with a replay. After replaying the blockchain all witnesses agreed the transaction was valid.
We will continue to monitor the blockchain for issues as we look for the underlying cause. In the meantime this particular failure can be mitigated by witnesses periodically replaying their blockchain.
Despite the "bug" everything is working just fine and your funds are safe.