Hello Evangelos Papageorgiou
In most cases, this can be resolved by updating your graphics drivers directly from the manufacturer website (i.e. NVIDIA).
You might also want to clear your user settings from File > SpaceClaim Options > Advanced > Reset All User Settings.
Make sure your computer is using the main graphics card for SpaceClaim/Discovery. Let me know if this works for you.
Regards.
You are navigating away from the AIS Discovery experience