Topic: Updating to the new menu
Just in case anyone else had the same problem I did...
I installed the new version of #!, but kept my home folder.
I noticed that the menu (super+space) had not been updated, and that several of the menu items ran commands that didn't exist anymore (trying to shut down the computer by selecting 'Exit' gave me an error message).
To fix the problem, I booted up the live CD and grabbed the menu.xml file from ~/.config/openbox and used it to replace the one I had in my home folder.
After that, everything worked great.