Check your pools and compare it with block explorer, some pools has fork...
weather coinium has a wrong frontend or they are wrong.
They dont find a block with low diff - seems to be they are wrong.
As time goes on i no longer love this CAT
What´s goning wrong here
I stop mining now - maybe forever
Edit: the last two days i were mining there withoun probs. I can not check each time i switch my miner
if pool is doing his work. I can´t understand this. And still a lot of miner there :-(((