Having the same problem. I'm new, but I think 5 days for a clearly-not-spam post to be approved is kind of laughable. I've made one doublepost already, even though it isn't showing up either. I thought after 4 days that I just hadn't posted the first thread at all, but none of my newer posts are showing up either. Been 24+ hours since trying to post them so...
Is this a particularly busy time for mods or a forum bug?