Hey Anastasia, sorry for the late reply — again!
I’m sorry for the confusion here, but I’m really curious (and I really want us to be on the same page here), but what do you mean when you said “related block” vs. the “random post thumbnails”? Do you have a block of related posts separated from your random posts? Have you made any code changes so that our plugin would show random related posts? Or am I just super-confused right now? ??
Also — you mentioned in one of your previous replies that you “just open “add thumbnail” modal window at “edit post” admin page and drag image in it, then save”, when inserting your images in your blog posts. Would you mind sending us a screenshot of where you apply those changes, since we weren’t able to find it in our ‘Edit’ page?
Finally — there’s no need to change the sizes of your thumbnails in the function.php file, since you can do it all in your plugins settings page. But you will have to re-enable your themes, since the ‘Customize CSS’ window is missing out, if the themes are disabled (as you currently have it).
I’m currently guessing here, but I strongly believe that this last thing might be the main cause of your missing thumbnails problem (although I could also be in the wrong, who knows).
Does this helps you out a bit? Let me know what’s up & I promise we’ll respond more promptly over here! We’re eager to get this sorted! ??
Looking forward to your reply! Take care & have a nice day!
Best,
Silvo