HI Andras, usually that is due to loss of numeric precision because objects are either numerically too small, too large, or too far from the origin.

My guess in your case is that it's too far from the origin.

It might be something that I can tune up, can you please send the 3DM model file to me at moi@moi3d.com ?

In the meantime if you move it closer to the 0,0,0 origin location it will probably behave better, change the "Mesh angle" value back to its default value of 10 degrees to make it re-mesh. Also it's not good to leave the mesh angle set to so dense as it will cause delays and excessive memory consumption to happen for the display mesh in regular cases.

- Michael