I'd assume the developers, it does appear to be their site. No support link on there?
Might want to find out how many confirms the pool is doing before validating the blocks also. It's possible that it's 200 confirms or something and you're not seeing payout because it's simply taking that long. Block generation time has dropped significantly (close to where it should be) in the same time frame you're talking about.
500Gh is receiving payouts avery few minutes
1Th receive nothing for more than 3 hours now
so there is a problem with payouts and not block confirmation matter.