Recently, just starting this month, every time I went ALT-TAB, I would go to the windows main screen but the game would not be in the task bar. I would have to shut the machine completely down and then reboot. I searched the web and apparently, under Windows 10, the Alt Tab key will bring up the last item used in the task bar. For me this was my Zone Alarm.
The solution, according to the Microsoft site, was to use the WINDOWS KEY and the D key. This apparently works. I tried it on and off line and did not have to reboot.
I also had the problem, starting around September 4, after going through a Alt Tab session, of having an encircled semi auto pistol show up on the Aces High III Splash Screen. It also showed up on the AH films during play back when I went from the small window to the large window to view the films.
Does anyone have any idea where this symbol shown in the attachments below may have come from. The only think I have done from one version to the next is the installation of Team Speak 3 on August 31 2016.