This is getting seriously annoying.
Whoever made it so that you could manually edit the radius of subobjects messed up bigtime because it keeps setting values to 0 or some really tiny number like 0.00000171, or sometimes even negative values (what the **** is a negative radius D:).
Which causes (predictably) a whole ton of trouble, including SUPER LAG, madly-spinning debris, etc. Not to mention a whole slew of collision errors.
Easily fixed by going through and hitting reset on every afflicted subobject, but usually, that means every single subobject.