I've withdrawn all I have from that site. It seems like it's been acting a bit scammy recently.
Once these problems pass, I will return here, but for the moment, it looks the best thing to do for me is to withdraw what I have and wait to see if they improve (they should be working fine though, the closure is probably to update the nodes they're working with, as the last update on those said nodes seemed to be one where they changed the way they send withdrawals from their site so they stop spending unconfirmed inputs because that was producing large chains of unconfirmed transactions that just caused an inconvenience to everyone who needed to withdraw quickly - however, that problem seems to have dissappeared now).