I installed the WP Smush Pro plugin earlier yesterday and sent 299 files to get smushed. All files were successfully sent but so far none have been fetched. It still says "smushing in progress." I saw that there are problems with the app working correctly when W3 Total Cache is installed (which we have on the site), so I deactivated the W3 plugin but it doesn't look like anything is happening.
Any idea what might be happening?