I'm having the exact same issue. Not only am I not able to insert any modules into prochannel, but when I do the entire DAW crashes. Did you get any resolution to that?
I am deep into recording a song and now suddenly none of my track folders will open. Did I accidently hit some setting that locks them closed or something. It has brought my recording to a screeching halt. I saved and restarted a couple of times to no avail.