I'm having the same problem.
I've been able to withdraw coins from Vircurex before no problem
However, I tried to withdraw about 400 ltc yesterday evening and I'm still waiting for them to show up in my wallet.
My account history lists the transaction but there is no TrxID.
I've checked the litecoin blockchain and so far there is no sign of a transaction.
I've also sent them a couple of emails with no response.

I've heard of this happening to others on Vircurex before and they sorted it out.
Still, it's a bit worrying having your coins in Limbo somewhere with no way of knowing whats going on.