Not sure as I store mine in Picasa. Fine tune them and post them when needed.
I see TONS of listings without Gallery. We're not the only ones! Ebay will surely have to fix soon! It happened to me Yesterday morning. First time I noticed.
As far as listings, you need to check your Seller Hub page. All of us received an extra 50,000 listings for July. You should have lots remaining. I could never uses all of those!