Was talking to a knowledgeable mate in Oz recently and he told me that at least two Banks. NAB was one and I can't remember which the other was - other than it wasn't my bank, received bail outs from the US Fed at the same time US banks were being bailed out. All kept very hush hush.
These are the same banks that were having a drama a few weeks ago with their ATMs not handing out cash - apparently also EFTPOS transactions were being delayed several days rather than being almost instantaneous.
That sounds like liquidity problems to me.