I took the majority of my funds off Gox a while ago but keep a coin or two there to play with. I have an unverified account, and to test out this FUD I just withdrew 0.145 BTC with no problems. Right now the transaction is still unconfirmed. Edit: It is now confirmed in my other wallet.
https://blockchain.info/tx/64d5580f5b133c2fffde6dc3f693b23fb14400834eb1d5847b0f4e2684cd356d
https://blockchain.info/tx/64d5580f5b133c2fffde6dc3f693b23fb14400834eb1d5847b0f4e2684cd356d
perhaps they have a threshold. if you're withdrawing more than XXX coins (worth $XXX USD), then you must be verified.
speculating.
It used to be up to 100 BTC daily. But JimboToronto now says he is unable to withdraw 50 without the verification. So they changed requirements, and I speculate there might be varying conditions upon which Gox decides what verification bullshit is required for a customer. Like country of residence, desired deposit/withdrawal method, and amount you wish to deposit/withdraw. There are 3 levels of account status - unverified, verified and trusted - the last one is with notarized and translated documents, but this used to be required only for big transactions.