I am using Cubase 12.0.70. I have a Cinematic Studio instrument in the same Kontakt7 with different MIDI channels, but I can't get the program change CC58 to work. How about you guys?
What instrument exactly? Have you checked if the MIDI cc was already taken?
Have you checked in the manual of the library? Sometimes there are MIDI assignments already set in the script.
Please don't confuse Program Change messages with CC messages. Which ones exactly are you sending?