@pvz and @wheeler:

I just ran into the segfault issue when using --rebuild.  It turns out that i screwed up some pointer cleanup, and that was causing the segfaults.  Luckily, the last update was so tiny that it was obvious what did it!  I just fixed it and committed it.  Please do a "git pull origin testing" and then try the --rebuild again.

It might also have been responsible for the other issues you observed, though I won't be sure until you try it.