ODE INTERNAL ERROR 1: assertion "bNormalizationResult" failed in _dNormalize4() [../../include/ode/odemath.h]
Stacktrace:

  at (wrapper managed-to-native) Ode.NET.d.WorldQuickStep (intptr,single) <0x00004>
  at (wrapper managed-to-native) Ode.NET.d.WorldQuickStep (intptr,single) <0xffffffff>
  at OpenSim.Region.Physics.OdePlugin.OdeScene.Simulate (single) <0x0078b>
  at OpenSim.Region.Environment.Scenes.Scene.UpdatePhysics (double) <0x00034>
  at OpenSim.Region.Environment.Scenes.Scene.Update () <0x0019a>
  at OpenSim.Region.Environment.Scenes.Scene.Heartbeat (object,System.EventArgs) <0x0000b>
  at System.Timers.Timer.Callback (object) <0x002a6>
  at (wrapper delegate-invoke) System.MulticastDelegate.invoke_void_object (object) <0xffffffff>
  at (wrapper runtime-invoke) System.Threading.WaitCallback.runtime_invoke_void_object (object,intptr,intptr,intptr) <0xffffffff>

Native stacktrace:

        mono [0x81ab4d7]
        mono [0x818e960]
        [0xffffe440]
        /lib/i686/cmov/libc.so.6(abort+0x101) [0xb7d0d181]
        ./libode.so(dDebug+0x3c) [0xb401a39c]
        ./libode.so(_Z10dxStepBodyP6dxBodyf+0x1a8) [0xb4050358]
        ./libode.so(_Z14dxQuickStepperP7dxWorldPKP6dxBodyiPKP7dxJointif+0x131e) [0xb4021f1e]
        ./libode.so(_Z16dxProcessIslandsP7dxWorldfPFvS0_PKP6dxBodyiPKP7dxJointifE+0x278) [0xb4050768]
        ./libode.so(dWorldQuickStep+0x47) [0xb40196f7]
        [0xb3ff0bfa]
        [0xb3ff0084]
        [0xb3fef6dd]
        [0xb3fee5f3]
        [0xb3fee454]
        [0xb68676bf]
        [0xb68673f4]
        [0xb686734e]
        mono [0x818e75c]
        mono(mono_runtime_invoke+0x29) [0x80b8aa0]
        mono(mono_runtime_invoke_array+0x50b) [0x80ba4be]
        mono [0x80bc65f]
        mono [0x80f5cca]
        mono [0x80f6b28]
        mono [0x80efc24]
        mono [0x8149305]
        mono [0x8162ee8]
        /lib/i686/cmov/libpthread.so.0 [0xb7e5346b]
        /lib/i686/cmov/libc.so.6(clone+0x5e) [0xb7db472e]