Hi Michael,

Thank you - your advice to turn down the display thread limit also helped fix the display refresh problems I was having with MoI3D v3 on a Lenovo Thinkpad T410 with "Intel HD Graphics" and Win7 64 bit.

I was experiencing very slow refresh and complete white-out blanking in either single or multi-view display windows - i.e. all or most drawn entities were disappearing, including the background grid - after zooming, selecting a drawn entity or deselecting all by clicking on a blank area of the display.

MoI3D display performance on my T410 now appears to be as good as my desktop PC by using:
"DisplayThreadLimit=1"

As it now works fine, I see little point in experimenting further, but I'm kind of curious to know what advantages if any, might be seen from using: 1 < DisplayThreadLimit < 'moi.ini (default) unknown number causing my reported symptoms'?