Looks like there might be some problems recently, rounds 1608-1610 ?
A 22 minute CGB round with 0 blocks.
A CSC round with a time of 00:00:-1
A 2 minute MEC round with no blocks, and now we're on MEC currently for a long time.
CGB having PoS problems. All orphans.
CGB isn't having PoS 'problems'...PoS overrules PoW by design. Long sequences of PoS blocks happen even for PPC, but it's about ten times more likely for CGB because of the one minute PoS blocks. But PPC isn't susceptible to multipool hash spikes that can instantly double or triple the network hash rate, many dozens of times throughout each day. Consequently there are roll backs when multipool or hashcows points their hashing at CGB right when a PoS block lands and/or in the middle of a sequence of PoS blocks. PoS isn't the most friendly kind of coin for multipooling. It's the risk you take when mining at multipools.