I ran into today for the first time my screen not showing the Z menu button, nor any of my designated favorites. There was one button (I don't know the right name) with two layers of rectangles. It shows open apps which I could choose among. I couldn't get back to the normal taskbar and the general Z menu button. I was able to Restart, and after that all looks okay.
This somewhat resembles in MS Windows when Explorer crashes. If you know enough to Ctrl-Shft-Esc to get Task Manager up, you can manually invoke Explorer again. If that is the type of thing I ran into in the Linux environment, what would be the equivalent way to re-start the overall desktop environment with the taskbar re-populated? Sorry to bother folks if this is common knowledge among Linux users.
If what I've run into is a bug, does it seem a Zorin package bug, or a component that Zorin folks didn't write but just included? Should I be reporting elsewhere?