USD have to pass through US banks, which aren't very cooperative. I think there are still withdrawals left dating back to mid June.
Enough with the bullshit. Nobody has reported that a US bank has refused an incoming wire transfer from Mt. Gox. If there's a problem on the bank side (which is questionable; Mt. Gox has never offered any concrete proof of this) it's at the sending end in Japan.
Mt. Gox doesn't seem to be having any trouble getting wire transfers
from the US. If some limits were being applied at the US end, there would be trouble sending to Mt. Gox from the US.