I’ve updated the driver for my W9100 FirePro card in the hope that it might solve my texture problem, however now all materials show up with wrong textures in the render mode while appear correct in raytracing:
Seems I accidentally found a solution for this. I double clicked a block instance with a wrong texture map, and the block file came up with a correct one. I saved the file and closed it so that the host file came back in front and suddenly all textures where correct again. Very strange, IMO something is a bit flawed with the new way of material handling in Rhino 7.