I have two languages on my Windows 8.1 computer: English and Russian.
When I use Alt+Shift while the language is set to English, everything is working as it's supposed to; however, using this shortcut when I have Russian language doesn't change it back to English.
I've tried to change the shortcut to Ctrl+Shift and it's working just fine. Win+Spacebar is also working fine.
The problem suddenly appeared today; there weren't any Windows or driver updates.