Blockexplorer also links #286209 to Slush, and the payout address is correct on both Blockexplorer and Blockchain, so either they are both right or both wrong.
No doubt it will get fixed in due course.
it seems your right block #286126 (which slush`s solved) was payed to the same BTC adress as block #286209
Now, this is a valid point and I agree there is a problem with the pool, but I am also sure it will get fixed.
Maybe it will discover the problem for the last few weeks or maybe it's just temporary glitch, but is something that deserves attenion, not 'cheasing ghosts' like the complaints before.