I cannot tell you how many times this has happened to me. I'll be waiting on a shape or paint to come down the line and have to backtrack through my whole platform only to find that the feeder belt or pipe is not sending or receiving. I have to select the belt or pipe receiver and "Delete" then "Undo" and it begins working instantly. It this something that is being worked on?
Lots of times I set a shape in my MaM and walk away. Go watch a movie or something. Only to come back and see that it wasn't producing anything the whole time due to a "buggy" belt receiver.
#Shape and Paint belts disconnecting or malfunctioning.
scenic yoke
serene kelp
Yeah, known issue. Hopefully fix coming soon....