s4what?

After over one hour my ad for a B5 S4 did not finish uploading.

Jusforfun

Sometimes you can open the page you are uploading to in a new tab and see the upload is actually complete and online. It is just the confirmation that has not been sent. If your ad/reply/post appears in the new tab it is safe to close the original tab.
As a precaution I often select and copy my entry first just in case I have to re enter it or the ticket has timed out.