Cubase 10.5 Drag/Drop Audio

[Ed1]

Hi @dfmsguitar and welcome,

do you have the latest update 2.1.2 installed?
This update has improved the overall stability of the application:

Scaler 2 Latest Version / Updates

2.1.2 (available 2nd October 2020): Fix an issue in the audio detection engine creating instability on the Windows platform and preventing mouse clicks from working correctly in some hosts. Fix a problem causing the chord notes to be held when triggered from Section C. Fix the playthrough of linked patterns; chords now play on the first trigger after switching pattern. Rest chords now play properly with the UI closed. Fix notes being cut-off on chord change when using Keys-Lock - Scale White K…

Regarding your first issue, Cubase does not support the drag and drop of audio file onto Scaler, but you can go in the “Detect” screen and select “Open Audio File” from the source dropdown: