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DM6437, VPSS/VPBE, not seeing OSD windows

Hello.

My question is as simple as this. How to make OSD windows appear on the display?

We're using 3 DACs to put a picture on an OLED's screen. After proper configuration I can see the video window 0 showing a chessboard, but I can't put the OSD Window 0 on screen. I was pretty sure I was doing everything right, but my configuration just doesn't work. 

What is the correct way to enable all the windows I want and make them appear?

Thank you very much in advance.