I haven't read this entire thread yet, but is this true? The TX ID can be modified and re-broadcast to effectively double-spend?
It's not true. Both versions of the transaction will have the same inputs, outputs and amounts; they are two different ways of expressing the same transaction, and only one will be accepted by the network, so there is no double-spend. No-one should care which version of the transaction gets accepted. (MtGox did care, and that's their mistake.)
+10000
If someone's core business is financial, and with all things aside, exchange is that;
why in hell would you be so stupid and not fucking store transactions in a way that nobody can fuck you over? Retoric.
Now, this basically means it's time for amateurs to step off this crypto train, and make room for some capable people to step in.
As much as I'm sorry to see that such human stupidity can ruin BTC market image and status and hurt so many people financially, GOX has to die off unless they show any signs of IQ, and that would even have to be at WARP 9.9 speed in these conditions for anyone to start back even remotely putting faith back at them.
Sure, it may look like this thread is bunch of FUD at first glance, but the basic technological problem here is so simple that for such amounts of money involved (and I'm talking about profit alone on trading) only retards, forgive me for saying like that, would do what these people do. And it has nothing to do with anyone in universe except the MtGox. It's 100% their shit. Period.