I have Amapi 7.52 but, like Hexagon and even Silo, just too many "siezures" ,jambs, crashes for unexplained reasons
One of the reasons I am so pleased with the working of MoI.

In terms of Polygon modelling, I find Carrara 6Pro--within it's limits--extremely stable and easy/logical to use.

I have Lightwave 9.3 but I find the workings of the modeller --to say the least--"ungainly" in comparison to ANY 2D or 3D app I have.. 

Anyone who who has LW and any other of the Polymodelling apps care to respond?

bwtr