To be a Bitcoin exchanger is a very risky business because they are target for criminals who steal money from bank accounts. According to rumors, the main reason to shut down the Bitcon-24.com is that someone is stealing money from bank accounts and launder them with this Bitcoin exchanger.
Therefore, the Bitcoin exchangers have many anti-fraud filters and sometimes they have false positives.
Also many banks don't want to provide bank account for exchangers - see Bitfloor.com:
The bank has issued us a check for the remaining account balance. Once this check is received, we will be working to establish a way to return the remaining USD funds.
The ETA for receiving the check is around 10 days. Until then, we will be unable to make any further payouts. We are exploring various options for returning your funds.
Also Mt. Gox have problems to open bank accounts and complain about this on their Facebook page:
Hello Mt. Gox customers. We get many questions re: "SEPA withdrawals", so we'd like to clarify a bit:
1) We would love to process every withdrawal immediately, but our bank has daily limits imposed on us
2) We have succeeded in raising this limit already, but high BTC prices make this more of a challenge
3) As a solution we are always seeking higher limits, but also exploring other options for SEPA withdrawals to expedite the process
4) HOWEVER, if you are in a rush the best option is to cancel the SEPA and ask for an "international wire" from Japan.
Thank you for your patience, and please rest assured that we are working hard to alleviate the delays.
Why not open a few more corporate accounts in other banks? I'm sure your current bank gets more reasonable as soon as you have other options...
If only it were that easy!