5.18 has been released, resolving many bug fixes over the past few versions. Unless another bug is uncovered, this will be our live code for a while. If you haven't downloaded the new code yet, give it a try.
Also, the sentry controllers and shields are back in stock. I also have a bunch of un-populated PCB's for the old standalone controller, due to a manufacturer mistake - I'm trying to get rid of them, so they're pretty inexpensive.