After testing the 32bit and 64bit builds, the problem I can confirm what was already posted here, it just affects the 64bit builds. When I go back and trace what’s being produced, it’s the 64bit Linux machines (the 64bit windows machines don’t appear to have this problem) that aren’t producing any coin since the latest releases. All of the 32bit builds (stock or custom) appear to be just fine.
I uploaded 0.3.8.1 for Linux with re-built 64-bit. I ran a difficulty 1 test with it and it has generated blocks.
http://bitcointalk.org/index.php?topic=765.0
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https://bitcointalk.org/index.php?topic=753.msg8417#msg8417