Hi, it sounds like a bug with migrated objects because i have a problem with migrated collections too. Any collections i migrated from cm07 to cm12r2 will automatically update their membership according to their old full update schedule even if i untick the box to not schedule an update at all. so changes are not being applied correctly in the background even though it looks like they are. newly created collections are ok. so you could try creating a new collection as a workaround and see if it updates changes to the clients mw's correctly? if it does, just ditch the old collections.