I have no idea why eBay doesn't offer six or four day. I think it would be in their best interest to let the seller situate their auction the way they want to have it..like yahoo allows you to set the length of the auction. (or at least they used to, I haven't used them in years) Perhaps an email to Suggestions with eBay might get the minds working over at eBay. (doubtful but we can hope)
As far as scheduled auctions, I had LOTS OF AUCTIONS scheduled last night and they all went up without a single hitch. No kick outs, no problems noted. Did you receive any error messages? Have you contacted Auctiva on a customer ticket to get an answer?
I'm sorry this happened to you.
Take care, Donna