Hey sp_,
i tried your miner with one of my igpu, but it won´t connect to pool if i mining to zergpool. On f2pool it sometimes work after 1 or 2 restarts via loop.
Yes, this version has a bug in the stratum implementation. Zergpool doesn't work properly. Try one of these pools instead:
miningpoolhub.com
hashalot.net
suprnova.cc
Version 3 is soon ready with improved stratum code.