I still can't use Block Masters, Hash Refinery, Zerg Pool or Zpool. If any of those are enabled, MindMiner close to freezes. I don't know the specifics behind what is happening, but in practice, what is happening is that MindMiner gets stuck at "Pool(s) request ..." for a long long time (we're talking several minutes per pool!). This messes everything up, from benchmarks which takes an extremely long time, to just simple mining.
Basically, with any of the above mentioned pools enabled, MindMiner simply doesn't work.
I should mention that I've tried using both "Europe" and "Usa" as region in the config, but neither did help. Also tried it from three different locations on 7 different rigs - they all have the exact same issue.