Hello!
I am using Taitana theme v3.7.0 on Osclass 8.1.2. My problem is that the product popup images are not working properly. You can see it on attached picture. Actually they work properly when I have jQuery Version 3 selected in the settings, but then some buttons are not working. So i need jQuery Version 1 selected. My question is: what can I do to get popup images working? I dont want to change the theme, because I like it verry much and my site is allmost finished. Please help me! Thanks!

That's some glitch with fancybox library, I would recommend to look on fancybox javascript, check it's version and try to replace it with older.
You may find all versions ie here:
https://cdnjs.com/libraries/fancybox