Problems with index buffer for terrain geometry

Build environment: linux, amd64, gcc, Ogre with multithreading enabled.

I'm following <a href="http://www.ogre3d.org/wiki/index.php/Using_PLSM2_with_Newton">this example</a> in trying to get PLSM2 working with my physics engine's collision detection (Bullet; not ogrebullet, though).

I can get the tile loading events consistently. However, <i>sometimes</i> the returned IndexData* will have a NULL HardwareBuffer, which either fails the assert or SIGSEGV'S on me when I go to lock it for reading.

The 'sometimes' made me think it might be a threading issue. However, the other threads in the process are just chilling in pthread__cond_wait(). So, I doubt that's the problem. Also, I don't want to rebuild Ogre if I can help it, so I'm putting that test off.

Any other ideas?

Rebuilt OGRE with no threading. Rebuilt PLSM2. Rebuilt my game. Relinked. That was irritating.

The problem still persists. That is more irritating.

I may have to write my own terrain manager at this point, given the state of things. Gives me the chance to integrate better with physics anyway.