That sucks. I haven't done anything with the title. I wish there was some way to nudge them.

Finally my last title was added. For info, it took two months. I think the other books only took one month for some reason. 
It's a big feature for Amazon because it drops the price on Audible by a 1/3.

As the pre proof copy shows the spine text, I would guess the front cover is the wrong width size. I suggest you check the width of your cover pdf file.
 

No 
I really like Allauthor, and I encourage people to become a free member, but I think the cost for their promotion is too high. They don't have an email based promotion. It's website based. So it's pretty limited exposure. You get some graphics that they'll send to you with the package. I think it's like 20 backgrounds with your cover. I've used them before a few times for ads. And when you first pay, your book will be at the top of the stack. But then it'll drop down with the thousand of other authors who've paid for membership.

I enter their cover contest on occasion. That's a nice way to get some publicity too. I also throw in my vote all the time.

So, I participate in their site, but I don't see a huge benefit to their marketing.

Yes. Well, audiobook promos is kinda of in an infancy, I think. I'm setting up a sale through AudioThicket & Excite Steam in October. Those two companies, and Chirp, are the only ones I'm aware of that promote audio sales. And so far the only benefit I've had with such promotions have been with Chirp sales (I ran a sale a couple months ago as well).