All,
This isn't going to work for everyone, however, there has been a known issue where sometimes Explorer.exe has been started more than once and prevents the Task Bar from hiding/fading when you
have certain programs in full screen mode (games, videos, web browsers). This usually only happens when it use to do it, but no longer does it in areas you know it should. The cause could be a number of things, but in most cases I have seen, the issue was
attributed to Malware/Viruses.
You can check Task Manger to make sure you only have one Explorer.exe. This can be done by right-clicking anywhere on your Task Bar > Task Manager. Click on the "Processes" tab. Click once on the word/column "Image Name" to sort alphabetically. Scroll
down and locate Explorer.exe.
If you see more than one listed, then highlight one, right-click it, choose option to "End Task". You'll get a message asking if you want to end Explorer.exe. Just hit the button labeled "End Process". Do this for every Explorer.exe you see. By doing this,
your Task Bar WILL go away, along with all your icons (temporarily). Don't freak out and DO NOT CLOSE TASK MANAGER.
Next, we will want to ensure a fresh Explorer.exe has been started. To do this, locate "File" top left of the Task Manager. Click it to show a drop-down menu. Select option for "New Task (Run...)". In the run box, type Explorer.exe and then either hit
the enter key on your keyboard or click the "Okay" button.
Test it out by using one of your programs where the Task Bar wasn't hiding before.
If this works, reboot your computer to see if the issue comes back. If it does, check Task Manager again - If there are more than one explorer.exe programs running, again, then something is causing these to start multiple times and more research would
be needed.