oh, haven't checked this thread for a while.
well it's fixed now after account verification.
in any case - i am really not aware why this was needed (in my case). I was far away from limits given on the site for obligatory verification.
mtgox's support answered that "maybe" i have used TOR, VPN, proxies or any public networks.
but i haven't.
later at some point "shared address IP network" was added to this list.
they have forgotten to add that i have used internet connection or even a computer at all