This message (see photo below) comes every time I try to save my model after running it. It seems like it is caused from when I select "None" in 3D Preferences --> Graphics --> Obstacle for Workers. Without this the workers wont be able to move around in my frame at all, so I am forced to use this setting.
I have tried to choose (after suggestions in another discussion thread in this Forum) a lower OpenGL level in the preference dialog under File --> Help --> Preferences. I tried with all levels, but non of them are working.
Also, I tried to open the program on different computers with different graphic drivers.
Are there any other suggestions from you guys that might help me with this problem?