Here's a possible explanation as to the "technical" issues that MtGox has been suffering.

http://www.reddit.com/r/Bitcoin/comments/1x93tf/some_irc_chatter_about_what_is_going_on_at_mtgox/

In short, Mt Gox wrote their own custom wallet software, which only worked because of a bug in early versions of bitcoin. The bug was fixed in a recent release. This would cause transactions sent from Gox to fail.

A group of people, thinking that they were being helpful set up relay servers that would take the transactions from Gox, fix them to work around the bug, and then rebroadcast the fixed transactions. The transactions could reuse the same signature (as they were the same transaction), but would be allocated a new TxID.

A second bug in Gox's wallet meant that their wallet client only checked it's own TxIDs, and never scanned the blockchain for other TxIDs on its coins. As a result, it is possible that the wallet ran dry, but the actual wallet client didn't notice, and transactions would block because of attempted double-spend.