[urgent] IPNC full feature usecase problem

We have a very important  demo next week, but right now we are stuck at this full feature problem. Your help or hint is greatly appreciated!

Custom DM8148 board, running IPNC2.8. YUV16 sensor.

CaptureDisplay usecase works fine. LowPower usecase works fine.

Full feature usecase has normal console output, but just no video output. HDMI displays gray screen, no frame is ever captured.

What critical registers or variables should I look at first?

THANKS!!!