Cannot use the taskbar to bring other windows to the forefront

I just upgraded my Lenovo E520 laptop to Windows 10 last week. All went fairly well except I have a problem bring focus to some windows. I see past forum topics with this problem (threads 14765 and 19244) but no resolutions so I'm starting a new thread. For example, I have my Firefox browser in the forefront of my desktop and two MS Word 2010 documents minimized. If I try to bring focus to one of the Word documents, I can hover over it but not bring it into focus. When I click the file to the left, it disappears and the Firefox browser window retains focus. However, when I click the second file (to the right), it comes to the foreground and obtains focus.


The order of the files does not seem to matter. I can close one file and then reopen it and it might be able to then get focus directly from the taskbar. Once I have one of the Word documents in the foreground, I have to click on the Firefox browser 3 times to get it to obtain focus. The only consistency is that clicking on a window in the taskbar 3 times in succession is guaranteed to give it focus if the first time doesn't work.

As I read my own description of this problem, it seems completely unbelievable that this would be a valid problem but it is. The only workaround I can see is to have each application/window in its own desktop but that's also silly.

Here's a video of the full problem description:

Is switching apps with Alt-Tab working OK? That would be viable workaround until some solution come up.
This sounds really annoying

Edit: could the non appearing word document be in the off screen position? Did you work before on two screen or something like that?

Ie: right click on problematic doc and select move. Then move it with keys.