How to fix a bug in Mathematica?

Question

Software and Internet Services

I'm using Mathematica 10. Everything works great, except for one nastiest but - every time I switch the layout Math shakes. In the literal sense - the window shudders. And after that, such a bug is observed: Mathematics puts random functions on random keyboard shortcuts, regardless of their previous assignment. For example, I press Ctrl+C, and Math, instead of copying, gives me a new notepad window. Or I press Preferences in the menu, and Math comments on the section of code that the caret is currently on, instead of turning on the settings. Switching the layout back does not fix the bug.
Has anyone come across?
Operating system: Windows 8.1.