Beta 18 (and I'm pretty sure a few versions before) seems to have a HAP playback issue when switching to MP4 clips and then back to HAP when the HAP loop res is 1920x1080
I have put some sample files here https://www.dropbox.com/sh/pza2gt2fb5n6 ... LfOra?dl=0
Open the Test.md8, playback works fine. Switch to layer set 2 for group B which is playing an MP4 and the HAP playing in Group A goes black (with some occasional flashes, can turn other colours depending on the loop). This happens no matter which Group is currently active.
Restart Test.md8 and switch Square_int.mov with Square_int-720.mov OR open Test_with720.md8 (which has the 720 loop already substituted) and the problem doesn't occur.