My Coolscan LS-50 is spitting out certain kind of films, but happily scans others.
I am feeding strips of 5 or 6 negs into the SA-21 feeder.
For the last 5 years I have used mostly tri-x, panf and apx100 with no problem.
Recently I have bought some Arista Legacy Pro (tri-x) and Premium 400 (neopan 400), but on insertion, the coolscan draws it in, and the spits it back out.
I have googled myself silly for two days, I just can't figure it out.
Original tri-x, xp2, apx100 still works.