I had a small amount, less than $300, in Mt Gox, and wanted to withdraw it to pay some bills. The only real option was a wire transfer, and I gathered the information required.
My checking account is with a Credit Union, and they do not have a SWIFT # of their own, they go through Wells Fargo as an intermediary bank.
Is this in the U.S.? Are you not aware of Dwolla? $0.25 per transaction. Takes about a week to get set up initially but from there it is pretty quick.
Today, I logged into my Mt. Gox account to find that not only the $50 I withdrew, but another ~$50 in fees have been removed from my account, for "unprocessed withdraw (invalid account number)"!
Now I'm out over $100, and have nothing to show for it.
Well, wire transfers are insanely expensive for amounts in the range you are describing (e.g., $50). If the transaction did complete, your $50 that reached your credit union would likely have seen an incoming wire fee as well, leaving you with just $35 perhaps.
Anyway, from here, what you should do is open a ticket and ask if there has been a change in status. If there was an invalid account number, then Mt. Gox got the $50 back and maybe there are fees that would explain the transaction you see.
To open a ticket:
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https://support.mtgox.com/anonymous_requests/newIf you need your money quickly, probably the best option to date is to buy a MoneyPak to load a prepaid debit card that can be used to withdraw at an ATM. That's not cheap, but it is quick.
In the U.S. though, withdrawing through Dwolla works pretty slick.