It doesn't crash on my Mac either, but it does use a fair bit of memory. Loading just the 50x50 baseplate with underside in LDView causes LDView to use about 228MB, while loading the standard one causes LDView to use about 66MB. I'll have to test on my Windows machine to see if it crashes there, but I don't see any particular reason why it should.
Also, check the "Curve quality" slider setting on the Primitives page of LDView's preferences. The default for that slider is the second notch, and anything above that will have a huge impact on memory usage of the baseplate with underside, with a much lower impact on the memory usage of the standard baseplate. For example, bumping the slider from the second notch to the third caused memory usage for the standard one to go from 66MB to 74MB, while the one with underside went from 228MB to 409MB.
For reference, the h version uses 643MB on the fourth notch, and that's just the one part. Also, no matter how much memory you have, LDView is a 32-bit app, so it will crash if it ever needs more than 2GB (or perhaps 3GB, but I don't think so).
Also, check the "Curve quality" slider setting on the Primitives page of LDView's preferences. The default for that slider is the second notch, and anything above that will have a huge impact on memory usage of the baseplate with underside, with a much lower impact on the memory usage of the standard baseplate. For example, bumping the slider from the second notch to the third caused memory usage for the standard one to go from 66MB to 74MB, while the one with underside went from 228MB to 409MB.
For reference, the h version uses 643MB on the fourth notch, and that's just the one part. Also, no matter how much memory you have, LDView is a 32-bit app, so it will crash if it ever needs more than 2GB (or perhaps 3GB, but I don't think so).