If I load grid.b3d into the test-anim.bmx program, it locks up when you press +/- so maybe thats a clue.
No unfortunately it does that with every non animated mesh.Does it work if you load the grid mesh, but don't scale it? Might be something to do with glEnable(GL_NORMALIZE) in TGlobal.Graphics3D
Also, does the grid load OK in light-test.bmx?