Smush Interferes With Wordpress Dashboard

I have been using the Smush Pro for about two weeks. A couple of days ago, it began interfering with my dashboard on Wordpress and would not allow me to even access the dashboard until I went through my host to disable it. So, I re-enabled the free version, and it worked fine for 3 days. Now, the free version is causing my dashboard to appear blank when activated so I had to deactivate it as well. I really like Smush and feel it has made a tremendous difference to my website; however, I need to be able to access my dashboard. Can you tell me what I need to do to solve the problem? Nothing else has changed on my website. Just the addition of Smush.