Who actually believe the issues with USD withdrawals are really due to technical issued with their banking partners? I think it is obvious that they are operating a fractional reserve and do not have close to enough funds if everyone wanted to pull out their fiat.
Why is that in any way obvious? Have you read the horror stories about Japanese banks on this forum?
Honestly, the issue is they do not have the cash and these capital controls are meant to prevent a "run on the bank" which would sink Mt. Gox. They are using customer deposits to pay ongoing legal, regulatory and operational expenses.
And the basis for your claims is? How come EUR and JPY withdrawals work if MtGox are broke? 5 million is just a part of their profit this year, and they have about 14 million USD in
visible bids in the order book. Even if the 5 million USD which CoinLab and Peter Vessenes stole are lost, they are still only have about 2 million USD to cover (assuming their extra legal costs are less than a million USD, which they should be prior to meeting in court). And they wouldn't need capital controls to keep 2 millions USD of deposits. MtGox is still the only exchange where you can spend 2 million USD on BTC without moving the price very much.