Daw chrashes each time when opening midi-editor

After working with my Cubase pro 9.01 a few weeks, suddenly when dubble clicking an midi-event to open the editor or opening by menu my Daw freezes. I did restart my Daw and opened a new empty project, opened a steinberg-Vst and recorded a few midi notes. Again a chrash or freez when opening the editor.I’ve tryed on other projects with same issue as result. On Appdata - roaming- steinberg - Cubase 8.5_64 preferences has been changed to dCubase 8.5_64 .



Is would recommend to trash a Preferences of Cubase 9.

Thank you very much Martin.Its solved.
I don’t know what’s the cause .