I have an old Nvidia 9600 gt. I got the message
Error - DWM composition is not running. Please switch to an Aero theme
I got that after rebooting, because last night Cubase was running fine.
I run windows 8.1 and HIGH CONTRAST theme.
I got it fixed that way.
- Right click on the desktop
- Choose under windows default theme :WINDOWS theme (the yellow one)
The message disapear and I can run cubase.
But I want my High Contrast back.