There’s a new release of Openbox available, and lucky me, there’s a PKGBUILD (and a package, if you’re lazy) on the download page, ready to roll.
Changes look to be minor — added Hungarian, a few bugs fixed, etc. The real attraction to me is the last item on the changelog: the addition of an --exit flag for the openbox executable.
That means I can now properly ask Openbox to exit when I set up lxpanel. Before I was using killall openbox, which is rather messy, and not very graceful. I hadn’t ever asked for an exit flag, but seeing it in place makes me very thankful. 
I’m also pretty happy that they added that feature. I’ve been wanting this for a while. Though killall openbox works, I always feel uneasy about using it. Perhaps the Openbox devs can read minds?
You’re welcome.