Uploading Products has Stalled Out My Site

Have been uploading E-Books to my site’s store today with no problem, but now it just stalls out as I try to add more. Otherwise the rest of the site works fine. It seems after I try to upload a new product, it only stalls out on the web browser I’m using to upload the product. If I use another browser, I can then access my site. However, the trouble starts when I try to upload a new E-Book for sale, and gets stuck in that upload process, which messes up everything.

Please help.