According to posts on BitcoinPool's own forum, it appears that the missing payments issue is indeed more widespread than just the one single instance noticed before.
The user audaibnjad has so far tracked 2 more blocks for which is hasn't been properly paid.
http://www.bitcoinpool.com/forum/viewtopic.php?f=1&t=26In the interest of being objective, Geebus posted that this is due to blocks being invalid and not passing confirmation. This should also fix the discrepancy in the historical payouts.
http://www.bitcoinpool.com/forum/viewtopic.php?f=1&t=27Just wanted to know, are there any plans to reduce the ammount of cheaters (mainly pool hoppers)? it seems that this pool's speed takes a dump whenever it's half way through solving a block.
When I was mining there, the speed would fluctuate through out the whole block quite a bit. It looked like people would hop on and request a few getworks, hardly process any, then drop off. A quick check of the user list doesn't show an active user or registered user with that name (subjective as it is) and smells like baiting to me.