When I boot my system - all shortcuts work well - no matter what layout is chosen. So I just press ctrl + c and ctrl + v (or in Russian it will be ctrl + c and ctrl + ΠΌ) and it works! After some amount of time (very different - may be a few hours or few minutes) it stops working. Shortcuts now begin to work only in English layout.
I don't understand what event causes this bug. Usually only 3 applications are opened during this time: skype, chromium and sublime.
Ubuntu 15.04 3.19.0-31-generic