Hi Gentakin,

The 0.2.8 release should address all these issue.  I've moved all the duplicate handling inside the same synchronized block so this should alleviate the race condition.  There was a reason for duplicate not being logged... Developer forgot... Fixed now though.  I've rewritten the whole duplicate check portion.  I found a couple of other possible problems in addition to the 3 you found so thanks for bringing my focus to this part of the code, it was very much needed.  It was originally added as a bit of an afterthought and not really tested thoroughly.

The tests you've been doing would make great unit tests... If only I could work out how to integrate phoenix into a unit test.  DiabloMiner might be an option for integration as a test platform since it's java based.