Jmonkey 3.1 native bullet bug

Related:
http://www.bulletphysics.org/Bullet/phpBB3/viewtopic.php?p=12158&f=9&t=
See last post there, jme seems to always calculate no matter the mass!

→ Seems only to happen with compoundshapes (for me)!
→ -> Does the sdk create a compound shape?
→ Apparently there is a calcualtion internally that results in somthing like
0NAN
now depending on compiler settings and random enviroment magic,
either
0
X = 0 is prefered
NAN*X=NAN

@normen since this might be build related.