What link did you use from Photobucket?
it should read
Code:
http://####.photobucket.com/albums/####/username/imagename.ext
Where the '####' are your individual section codes for server and subgroup.
For example my
uses the following URL:
Code:
http://i634.photobucket.com/albums/uu61/familiarelementspets/dragon_1.png
There should be little dropdown boxes that will give you all the links, you'll want the "Direct Link" option.