From the thread that Gox linked to:
2. Whos affected by this problem?
People using Dwolla for their withdrawals, along with 5% of US Dollar wire transfers which is an unfortunate flow-on effect.
Could it be that you're seeing that "5% flow-on effect" that they refer to?
I don't understand what that means, or why problems with Dwolla would affect unrelated US Dollar wire transfers.