I'm using Opera 9.64.
It's set to accept cookies, and I have nothing special setup in the security section. It must be stuff that's done specifically for IE, I dunno. Actually Photobucket seems to be working fine, I just checked it. It was probably an older version that had problems with Photobucket, and I was just so used to opening IE for that site that I hadn't checked to see if it was working now.