wp-smush is hung up and not responding

Yesterday I attempted to smush 608 images from this site (sunsetsunglasses.com). First, only around 589 were uploaded for some reason. Then, it said I had to wait 14 hours to complete. Now, today (24 hours later) I got a message in the plugin's page that said that the images could not be uploaded to the server. Also, the system looks to be locked up because the "Smush" button is not active and, when I go to the Media area all of the images say that "smushing is in progress". I don't know how to get out of this so that I can attempt to smush the images again. What do I do?

I have activated the Support access to this site in case you wan t to see the problem.