Think obconf has been part of ArchBang from day one of its first release. Recent changes upstream have meant that Archlinux no longer supports package and now it can only be found in AUR. The bad news is that at the moment package is very broken. Am no expert but I assume the patches are no longer working.
There are other options, you could use lxappearance-obconf [gtk2] or obconf-qt [QT!]. Lxappearance-obconf-gtk3 is main repos but is might suffer the same issues as obconf.
For now I will remove it from iso, you can either manually edit openbox configs or post install grab one of the above packages. I will not be shipping gtk2 or QT for one application.
There is still hope as I can find obconf in arch package archives. Something a simple search online can find.
Still waiting for new kernel image to appear, if not I will get something built over weekend.
Stay safe 😉