Minor installation bug when I installed 5.9 tonight. I have scheduled my daily charging to begin every night at 12:05 for my utility's very low off-peak, time-of-use metered rate (6ȼ/kwh).
I received notification of the 5.9 update when I left work around 6pm; when I got home I immediately plugged in the car in my garage and hit the 'install now' button. Went out to check things an hour later and it was installed, but interestingly it was charging at full current at 7:30pm. So... after installing the update it ignored my scheduled charging at my home location and immediately went into charge mode upon re-boot. The screen still said 'charge at 12:05AM at this location', so the schedule wasn't erased, it was just ignored.
As I said, a minor bug, but if this happened during a utility emergency when they hike peak rates for EV users to 1-2 $/kwh in the summer, it could be annoying.