My AuraHD 3.1.1 is using Koreader 868 and I am about to update it to 912. It has always been working well enough to be my primary reading software. "Bugs" could be ascribed to any software that is under development. I would not really like any software that was not under development, for that would mean that it does not improve or evolve.
I have used most of the builds prior to 868 and noticed nothing but a steady improvement. I can post back here if the update to 912 has any problem that effects my reading.
This might help:
https://www.mobileread.com/forums/sho...d.php?t=226456
Edit: The 912 build and the current KoboLauncher all working well.
Luck;
Ken