somehow i cant go to the site "imageshack.us" nor view pictures from "imageshack.us"
i have no idea why, please help me. and because i dunno where else to post this topic.

works just fine for me, im running firefox too, always used imageshack always will

[ http://www.imageshack.us ]
^ Try that. Certain sites don't have the ability to leave out the "www." part... Most do, but some don't. It's been working for me.

nope, cant even visit the site. i think i blocked it accidently, but i cant unblock it

I have exactly the same problem as you do.
I don't know why though.
//edit: I don't think you blocked it. I haven't blocked any sites, and yet I still can't view the main page or any ImageShack pics.

By the way, there is already a topic about this in The Lounge.