Alt and AltGr usually work well but sometimes, for no reason they stop working. Restarting the computer doesn't work. I checked the keyboard language. I checked if I have one of these programs running in the background (List of known programs blocking Altgr):
-Remote Desktop Connection -Windows XP Mode (Virtual PC) -EasyTune -VMWare vCenter -mRemote -VirtualBox -Ditto -Unknown wmp (winamp?) plugin -Visual Studio 2010 (an add-in perhaps?)
I have a 2015 Acer Aspire with Windows 8.1
Is anyone aware of a different problem that can cause this symptom?