My guess is that it's more to do with FB than anything. I had limitations until I reached 10 (I believe that's what the requirement was per eBay).
Maybe try listing a couple a day through Auctiva, if you find this is what's actually causing it.
I just remembered, I couldn't do any Buy It Now listings until my FB was up. Maybe that's what's causing it??? If eBay's support was worth a darn, I'd suggest asking them. I doubt you'd receive a relevant answer though. Quite the opposite of Auctiva's support! However, maybe they'll surprise you and actually read your question.
Good luck!