Materials not showing in 3D OpenGL / GeForce GTX 550 Ti

[Anonymous]

Problem: "GeForce 275.33 Driver" causing a "materials not showing" problem in 3D-window Open-GL mode.
Se this topic: archicad-talk.graphisoft.com/viewtopic.php?t=36633

Solution: Install older driver "GeForce/ION Driver v270.61".

I'm experience the same problem and I suspect the graphic-card which, in my case, is GeForce GTX 550 Ti. I recently upgraded 4 computer's and they all have the same problem (and the same graphic-card type).

It's only in OpenGL mode that this occurs. Renderings are fine and Internal mode works fine.

I'll run some test and maybe I'll be able to post a solution soon.