Go to www.map-craft.com That should give you plenty of answers. Whoa! When was Filefront re-formatted?
I assume by "FileFront" you mean "FileFront Forums", in which case the answer to your question is as follows:
When the forums were upgraded from version 3.5.4 to version 3.6.1, thus adding extra features, rendering some of the old custom features useless, and removing all compatibility with the old custom forum skins.
The [color=darkorange]forum announcements[/color] are your friend. You shouldn't neglect friends.
I don't know how, and I don't know why, but this is totally Sheep's fault.