Hi, I assume 3.3.1 in the dropdown is referring to version 1.3.3, which I upgraded to today.
After I did so I noticed clicking on a thumbnail in my gallery doesn't work anymore. I reset to default and lo, it was working again. After changing my settings back it stopped working again, so I reset again, then changed one-by-one to check.
When I set "Show Play Button" to Never, the problem occurs.
I didn't have this problem using the previous version.
I am using images from the default Media Library, and the [slideshow] tag.