Missed it by that much (3/8" to be specific) was locked before I could get back here and post an update. No issues printing the ruler.
That said, I’m as confident as I can be that I didn’t move the gantry, material or anything in the UI (except ignoring some layers and changing the cut settings) between the two runs. But no way to prove that either way now.
Which brings me to the feature request - we should be able to lock/unlock the position on the artboard and each of the layers settings so they cannot be accidentally changed.
Alternatively/additionally, allow manual saving not just auto-save so users can specifically save locations, settings, etc. and not loose that accidentally or intentionally.