Misel Kuser
Subscriber

Solved! 

If somebody else has the similar problem.. For me the solution was to use opengl driver.

On Linux starting from the terminal: fluent -driver opengl
Or set the environment variable: FLUENT_LAUNCHER_OPTIONS=-driver opengl

Source:
https://www.afs.enea.it/project/neptunius/docs/fluent/html/ug/node15.htm