co niektóre karty graficzne, bardziej ich sterowniki powodują problemy tego typu. Na jednym lapie podczas przeciągania mi wszystko zanikało i pojawiało się , różne dziwności. Jaki sprzęt?
Ze strony producenta:

We recommend an NVIDIA Quadro card with at least 512 MB of memory. Other graphics cards can be used, but they must offer full OpenGL 3.0 support (typically manufactured by AMD/ATI). We have seen some issues using AMD/ATI Radeon graphics cards.

We do not recommend or support the use of onboard graphics found with some PC configurations. These do not generally have the capability to drive graphics intensive applications such as Mastercam.

Make sure you are using up to date drivers from your card manufacturer. We often see issues that are resolved with updated video drivers and the driver version can have a great impact on how the card performs.