I just edited my sig/forum image in that I cleared my sig and put in a forum image in its place, per Subeta rules. HOWEVER, my sig is still showing on my end, clearing the cache has not affected it and I have nothing in my sig box anymore in my preferences. I've done this before and it normally takes five to ten minutes to update like a cache issue.

[edit]Nearly half an hour exactly and my sig still hasn't cleared.

I tried to update my signature about a week ago, and it took a couple hours to go through. I assume it's a caching thing, but it definitely takes way too long.