> It seems that I need to set the depth to something other than "none" in IB. 
> Setting it to 32 resulted in something being drawn (although there was 
> leftover stuff from another drawing operation, partly because the composition 
> I loaded doesn't clear the frame).

In general, you'll want depth to be 24 (most GPUs are optimized to use 24bit 
depth buffers).  Also, you might want to try clearing the context with 
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); before rendering to ensure 
consistent results, regardless of whether the input composition clears it for 
you or not.

You might want to file a bug report on the no-depth-buffer problem -- at worst, 
something should get logged to the console so one can figure out why something 
isn't working as expected. _______________________________________________
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