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.  A real-life exchange or investment bank is required to put customer funds in segregated accounts, but this is not the case with Mt. Gox. 

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.  Considering they missing over 5M being held by the US Government and need to keep a substanial reserve for possible legal settlements, things will not get better anytime soon.  It is not conforting they are lying about the real reason (it probably criminal), but I see why they are doing it.  They are hoping to "earn" themselves out of this hole and hoping for a settlement in the near term with the US Gov for the frozen customer funds as well as Coinlabs for the Mt. Gox customer funds they are withholding and legal settlements.

Mt. Gox USD is trading at a substanial discount to real USD, hence the "inflated" value of BTC on the exchange as it is the only way to get funds out of Mt. Gox.  This is going to end badly and it is dangerous to try to time this.  Once Mt. Gox goes bust, there will be lots of missing customer funds, and after a long legal and complicated liquidation process, depositers will get back pennies on the dollar.