I found a bug (probably with gnome):
Steps to reporduce: Open settings, appearance and turn on auto-hide-dock.
Then use Ctrl+Shift+PrtSc to do a cropped screenshot while the task bar is hovered by your cursor (while it is expanded).
It will lag the task bar and the icons will not be clickable.
I have the latest amd64 build, but it has been happening on older versions also.
- Then you can only use Super+Tab to switch between apps, or Super to search & start an app.
You need to restart pc in order to fix it. (Until you will attempt to do a screenshot again)