Well there is something wrong with the project im trying to copy my fx chains from. Its my old template ive grown since cubase 7 and somewhere down the line it’s become semi corrupt. In that i can’t add any channels without it crashing. But apart from that i can still mix/make music in it.
I re-saved the old template in 9.5.40, quit and reopened. Then resaved all the fxchains.
Opened the newly made template - Loaded the Drum Buss fxchain and it worked. Then after that one time none of the others load.