So it seems once you move the loop/slice start point forwards it changes it in the “assign sound” preview page, for all sounds from that point onwards. However you cannot move backwards, only forwards, and this includes on all other channels where the start point hasn’t even been touched.
The only way to reset it, it seems, is to power the machine off and on. Pretty annoying! This explains why sometimes you won’t hear sounds in preview until you load them though.
I like the idea that you can move the point in the assign window, IF you could move it back, it’d be a great way to scroll through long samples, however currently, it’s a major bug.
Cheers!