OP, I've had issues with this recently too. for me, when I switch from one Scene Collection to the other, OBS *looks* like it's crashing, so I would just go to Task Manager and end the task - but today I found that if I let it sit for a few minutes, it ends up switching to the other collection, even though it takes a while. try letting it sit for a second? hope this ends up working for you too, good luck!:)