I have the HTML version of my OpenGLView app working (with tracing), but the windows build simply displays an empty window. There is also no console window (presumably due to no_console=1 in the auto generated options.txt file).
You can cd to the bin folder and run it by typing the name of the exe. Any stdout or errs will be redirected as normal, including traces. That’s what I do.
Alternatively, you can just do openfl test windows and it will open as soon as it’s built, and the behaviour will be exactly the same.