As far as I know, the images can be in posts with no problem but I'll go make double sure it's on...
...but I turned it off in the signatures (as I also do on the Alien Soup boards).. While nice neat small buttons in signatures can look nice, very few people end up doing that.. It gets out of hand mighty quick, and the boards end up getting really ghetto looking very quickly...

Only images you can have in your sig are smilies.
Thanks for the question.. Oh, and an official F U since I haven't gotten to welcome you before!
LOL