I'm surprised to read this. I noticed a few weeks ago that the standlight wasn't working on my 5 year old unit. Did a bit of surfing, and would you believe Peter White nailed it again? I had the connectors reversed, probably did it when I put a new cable on last fall. A few minutes to correct the connectors, and the standlight is working again!
On top of that, both my blinking backups failed in a heavy rain a couple days later. One blinkie shorted out, it's working again after drying and recharging. The other one had drained the batteries, drying and replacing them got that one working. The B&M provided light all the way home.