Given the amount of complaints lately and the striking similarities with fiat withdrawals, it's probably not a far fetched idea to say that they are insolvent at all.
They would've made staggering amounts of money during the bubble and they really would've had to have worked exceedingly hard to lose it all.
I would presume any USD delays are down to them changing banks. They recently hooked up with HSBC which is probably the end of a lengthy process of disruption.