Alrighty, I thought I had copied and pasted the information... where'd it go?
So, I downloaded a nightly:
Version: (2016-12-22 revision d365dc5)-makepkg, release build
And, it FIXED a couple of issues that were causing me problems. Then, stable 4.0.5 came out, and it had the same problems/bugs/issues/lack of neat features that the nightly had. So, I reverted back to that above nightly.
(I might be a little off on the timing of releases. I have NOT tried 4.0.6 as I'm working on important design).
Then I installed the TEST nightly; since everyone else is doing awesome work on this software I figured that it was the right thing to do to try to also help.
The TEST nightly crashed 3 times on me when selecting the layers.
After selecting the legacy canvas, then the OGL canvas stopped crashing.
Re-installed the nightly that I have saved locally, ^^^ same version as above ^^^, the "Wizard Footprint" feature had missing Python scripts that I had been making great use of.
Did the uninstall mentioned in that bug report.
Then RE-RE-installed the nightly.
Then had the FIRST crash I have had with that nightly in over 4 months, using the software almost daily; and some days for very long periods of time (up to 16 hours).
This same nightly was put on ~5 persons (vastly different) laptops while at the maker space. None of those members have complained about crashing, but I can ask explicitly next week.
There are 2 major differences in my use of the software prior to using it "Rock Stable".
1) The first is changing between revisions. My versions went forward and back and forward again.
2) My extended use of OGL to highlight the nets between Eeschmea and PcbNew. I NEVER had PcbNew crash when it was the only open window. Maybe I just got lucky?
Anyways, over 3 months without a single crash, and thing bang-gone, something behind what I did appears to be the likely culprit... or it was just dumb luck... LOL... trying to help but I know how these things are.