The problem: I have an issue that occurs when I have a lot of windows open (12-20); when I click the taskbar to switch to an app that is open but not in the front, it sometimes will just disappear behind all other open windows. For example, if I have Chrome open and in the front and want to go to a Word document (or anything else either minimized or behind the front app), I would click on the program in taskbar, the app will flash up - but as soon as I click on the app, it then moves to the back behind other open apps. The same thing happens if I click on the App directly - it will not come to the front. I then have to minimize all other apps to get to the app I want to use. I have tried unchecking Activate Window by hovering over it with the mouse but it was already unchecked. I saw this thread

Taskbar bug: switching to another window -will not appear at the front

The issue was raised by mmdali and Christi in that thread (a long time ago), but I saw no resolution.

Any help would be greatly appreciated.