Smush Pro not working

Hello,
I have an issue with the Smush Pro. The bulk smush is basically not working, it got stuck at 28.3% for days, I have even tried to reset it and it is in vain. I have a total of 5301 images to smush and the pro was the main reason for the WPMU DEV subscription, please advise as soon as possible.
Thanks so much,

Ana