R1863 on OSX - hosed?

[abs1nth]

ok in Vamos_Body::Rigid_Body::propagate, in the loop, body_force sometimes is NaN, which results in total_force, total_torque, delta_omega, delta_theta also being NaN. then the call "translate (delta_r - m_body_cm);" causes m_position, m_orientation etc to also be NaN here:

#0 Vamos_Geometry::Three_Vector::operator+= (this=0x12a7070, vec=@0xbfffd444) at src/vamos/geometry/Three_Vector.cc:166
#1 0x00037126 in Vamos_Body::Frame::translate (this=0x12a7070, delta_r=@0xbfffd444) at Frame.h:95
#2 0x00117bac in Vamos_Body::Rigid_Body::propagate (this=0x12a706c, time=0.0040000001899898052) at src/vamos/body/Rigid_Body.cc:474
#3 0x000f3b48 in Vamos_Body::Car::propagate (this=0x12a7000, time=0.0040000001899898052) at src/vamos/body/Car.cc:1058
#4 0x0013b32a in VAMOSWORLD:hysUpdate (this=0x7adcb0, dt=0.00400000019) at src/vamosworld.cpp:2402
#5 0x00141b82 in VAMOSWORLD::Update (this=0x7adcb0, timefactor=1, fps=250, js=0x278420) at src/vamosworld.cpp:724
#6 0x0003194a in GAME::Update (this=0x2765a0) at src/game.cpp:228
#7 0x000347ad in GAME::Start (this=0x2765a0, args=@0xbfffe7f0) at src/game.cpp:1650


adding a "if (!isnan(body_force[0])) {" at line 434 in Rigid_Body.cc seems to fix the problem, but i really have no clue why