In corona 7 im experiencing some issue with Multimap whereby it is set to randomise by instance across 20 different objects with ten different bitmaps but after manually changing the seed around 40 times without being able to find a single iteration where a bank of six objects next to each other, werent having the same map applied, i gave up and ended up manually assigning material IDs.
Ive not noticed this before in previous versions. Has anyone else seen similar behaviour?