Altgr randomly stops working on windows 8

There are many blog posts out there, which try to explain what the issue could be. Many times specific programs are the cause of the problem.

For me it was a Windows Remote Desktop connection I had running, that prevented the key from working. I didn't have to close it, just opening the window and clicking anywhere inside it somehow made my [AltGR] key work again!

EDIT: It seems to the related to the full-screen mode of RDP.

Just try to close all your applications one by one to find out what could be the cause.

Here it turned out to be a running VirtualBox-instance that had tampered with my keyboard setup. After shifting focus to the VM and back to the editor the AltGr-key worked as expected.

I'm running Windows 7 SP1, so AltGr acting as Alt is a problem not only on Windows 8.

For me, it was caused by Hyper-V (Microsoft virtualization). When I go to virtual machine, press AltGr it works. Return to desktop, works again!

The questioner have a laptop, so this is not probably answer for him/her. But nevertheless:

One possible reason of AltGr problems is Gigabyte EasyTune. It adds some own shortcuts to keyboard (or something else), which causes the problem.

Atleast with nordic keyboard maps: it causes problems with '@' [AltGr+2] and '€' [AltGr+5].

With Win8.1 solution was: uninstalling of EasyTune.