Ghost button controllers on the stip

Have a very specific problem (I getting use to) but someone can help me maybe.
In the mix console, on each channel strip, every button disappears and there is a kind of grey spaces remaining for entering some specific numbers (normally the space just near the button itself)
after re-installation, everything goes back
and after restart, it become ghost again.

Everyone has the same issue?
Happy new year with or without knob controller
Capture d’écran 2015-01-01 à 13.36.28.png