I have darktable 3.1 running on my laptop and PC. On PC I have compile it from sources (I have here OpenCL working) on laptop I have installed package from ppa ubuntuhandbook1 (no OpenCL here).
The issue I’m observing is that very quickly I have black rectangle for image, preview and export instead of an image itself. Or just for image and export. It depends.
The simplest case is: color balance, filmic rgb, local contrast just activated and the image is gone.
Filled issue on github. There are more details and logs.
Where shall I start investigation? With current state DT 3.1 is useless for me.