Hi,
I followed the IniBuild "Return to Airliner part 1" video.
And after the APU has started up and I turn on the APU Bleed for the PACKS, the APU line goes green, the selector does it's thing, but the PACKS do not come on.
I then tried to re-install the Enhanced pack again, then it worked! I was able to complete the tutorial.
However, today I had the same issue. I tried re-installing the base and enhanced pack, but unfortunately.. the issue remains.