Found another one, but you guys should like the ones that are easy to reproduce, as this one is.
Accidental Discovery: I noticed my build times between left and right extruder are off by nearly DOUBLE... IE, right extruder says it will build in 1hr 45 min. and left extruder says 3hrs and 7 mins. Both extruders set to MEDIUM quality, all settings match.
Then stumbled on the bug by switching setting a few times. The MEDIUM print setting does not work. If you switch to HIGH quality it makes a change, and if you switch to LOW quality, it changes again. But Medium is either HIGH or LOW, whatever setting was used last. It turns out I printed a part on HIGH a while back and unbeknownst to me, all my parts since that part have also been printing on HIGH regardless that it was set on MEDIUM. The default medium setting seems to be missing.
Regards,