Basically, vBulletin (the forum software on which HJU is based) does not get along with PhotoBucket after some of the recent updates it's done in the last few months.
You're better off re-uploading the pics onto a different site (like ImageShack or what not) instead of PhotoBucket. Another option is just posting the
Direct PhotoBucket link codes here, and putting them all within the "CODE" tags (similar to the "IMG" tags). It will end up looking sort of like this:
Code:
Pic 1 *Direct* link from Photobucket here
Pic 2 *Direct* link from Photobucket here
Pic 3 *Direct* link from Photobucket here