So, as mentioned elsewhere, the "Add an App" function is still present on the Apps menu of the Bolt, but appears not to work, always giving a 307 error, at least with my site and David Blackledge's.
Additionally, the zeroconf announcements from HME for Python are not being recognized. The Java SDK sample announcements do
work (although I can't then get the apps to leave the menu by shutting down the server, but that's not a new problem). The apps themselves work, and interestingly, I can run the HME for Python apps whose names happen to overlap with the SDK samples -- but only those -- by launching runsamples.sh before start.py.
I hope TiVo will fix these problems, but at some point, I suspect they'll shut off HME functionality rather than bother maintaining something they no longer use themselves. The bits are already rotting.
Meanwhile, I'll keep trying to figure out what the heck the Bolt doesn't like about HME for Python's announcements...