[SOLVED] Background Image no longer shows with 3.7.18

We just updated to the Atahualpa 3.7.18 version and now our background image will not show. It was working fine in the last version. I set the background as it states in the "Body, Text & Links" section but still nothing. I reset it back to the default and still nothing. Again, it was working fine in the previous version. We are (were) about to go live but can't until this works. I can only imagine there's something wrong with the update. What do we do now? Thanks for your help.