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)
-VMWare vCenter
-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?


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