I'm also in the same boat as you guys. I posted my first listing today using Auctiva, received confirmation from eBay that the listing was active, but I can't find it during a search. My counters also suggest nobody else can find my litings either. I've used the great advice on here, but don't seem to have any errors. It all seems very strange.
I wonder whether it was because I already had a non-Auctiva listing active. Any suggestions you may have would be greatly appreciated.