Also important to note that all emulsions have different rheolgies and viscosities. Second, there are sharp/rounded options on the trays. Also speed can fall into play here. And number of coats/passes. Surely loose corners may be an issue as Rick mentioned. Tension meter will point that out. Check the corners vs center. Settings on the machine may be adjusted however, I would advise to check with M&R on that. This is not an uncommon issue, regardless of machine. Many keep scrape cards as a bandaid but the that sort of defeats the process of being automated. As I stand on my soap box....do the reseach and excersize one variable at a time. It normally takes time but the pay off is well worth it!