Hey guys,
I urgently need help

!
I'm working at home at some own music projects with the following equipement:
Interface: Focusrite Scarlett 18i6 USB
Software: ScarlettMixControll
Sequenzer: Cubase 5
My problem:
I start Cubase normally, check out my interface connections setting their in an outputs and all works fine. (I see i get an input and i can hear it also directly in my headphones). I play back some sound, already recorded in Cubase and can hear it perfectly.
I open ScarlettMixcontroll to split up my mono signal to a stereo, so I can hear the input on left AND right side.
But as the window appears, something with the panorama changes.
And if i go back to Cubase I do not get an input while recording or get a sound if i try to play back a track! So nothing, that work befor works anymore...
Closing MixControll did not help as well as a restart of my pc -.-
Can anybody help me with that problem?
Thanks!