It might not be your ISP. Our server may have temp-blocked your IP, because it felt you might have been doing something suspicious. Do you use IE or FireFox? Do you have any browser tweaks installed that speed up the browser? If so, this may open too many concurrent open connections to our server, which would trigger the block.
If you dont have anything like that installed, then give Trophaeum a PM and include your IP; he may be able to check it out for you. Just don't bug the guy unless really necessary, as he's a pretty busy dude.