issue with viewing photo galleries

Hi there,
since the v.4.2.6 of Slim Stat, I noticed that my photo galleries don’t work properly, and clicking on one photo, it brings me to a white page with my picture freely downloadable. When the Plugin isn’t active, this doesn’t happen.
If you need, You can access my admin page.
Can you help me, please?

Thank you

I’m working with Windows7, browser Chrome, and my site is on a linux platform

https://www.ads-software.com/plugins/wp-slimstat/