It seems I've uncovered another bug... When rendering (AME or direct export from PPRO CS6), the app crashes. No certain point, although usually in the second pass (H.264).
From the Event Viewer:
Faulting application name: Adobe Media Encoder.exe, version: 6.0.3.1, time stamp: 0x50575647
Faulting module name: mc_enc_avc.dll, version: 9.1.7.3633, time stamp: 0x50292555
Exception code: 0xc0000005
Fault offset: 0x00000000000dfb74
Faulting process id: 0x1430
Faulting application start time: 0x01ce17b61ea415b9
Faulting application path: C:\Program Files\Adobe\Adobe Media Encoder CS6\Adobe Media Encoder.exe
Faulting module path: C:\Program Files\Adobe\Adobe Media Encoder CS6\mc_enc_avc.dll
Report Id: 7a33b540-83b0-11e2-b7af-00224d8921b1
This happens regardless of having GPU acceleration on. I've been having a bug with that too, but that's another story.