mouse's lag during playback and lane's pb

2 problems really annoying in cubase pro 9.0.10

  1. play or record a track and during the playback do actions with mouse :
  • the mouse doesn’t respond , I have to click a number of times before it works it’s a nightmare when we are in mixing phase !

I trashed the preferences and it’s the same , it’s since the v9 , v8.5 worked perfectly with the mouse.

  1. recording in layer stack mode on a midi track :
    sometimes the lanes are not audible … ? when I select S for soloing a lane = no sound ! (same thing in v8.5)