Windows 10 thumbnails go missing

Does the issue happen only when 7+ Taskbar Tweaker is running? What do you mean by "don't respond"? Which options are you using with 7+ Taskbar Tweaker?

When I hover over them they don't show up. Clicking the button is just fine. I closed 7TT and they came back. I'm on Windows 10 Creators.

Here's my options.

Please check if that's the bug you're having:

https://tweaker.userecho.com/topics/116-thumbnails-not-displaying/#comment-779