Brian,
I found a strange work around, -I do agree that it has to be faulty geometry. But I was able to fix it by entering a high enough number of breaking pieces. I usually put in about 20-30 and noticed half of my model was uncovered (black) or had rigid texture (bad geometry). When I started adding more pieces, it began looking closer to my original texture. I think I broke mine into 75 pieces for it to look normal again.
Don’t know if that might be your issue, but it helped me! Thanks again for the heads up!!
Doug