Serious error in Cubase.exe while setting up a side chain

I was just setting up the side chain in the standard Compressor on a Padshop track in CB to be trigged from a midi bas drum track when this happened.
It seems that whenever i try to use a feature ive not used before it turns out to be so much hassle and time consuming.
I feel like i dont stand a chance these days.
Windows 10 pro, CB Pro 11, Nvidia GTX780 running old drivers.

Cubase 64bit 2021.5.31 (651.9 KB)


Reported to Steinberg. Thank you.