Which gives some examples of the risks that flash files can pose. That being said though, I would estimate that most flash developers wouldn't be able to do this or know how to but the risk is always there.[/QUOTE]
I'd like to summarize (without reading the above posts

) that if you enable HTML or anything that supports scripting in posts/sigs/etc., you might as well shoot your forum in the head while you're at it. vB code is the safest you can get, and even then, custom vB codes can screw you over if you don't write them very carefully.