Yeah, SallyC, I didn't ever remember the charging light as you mention. My light has never been on solid from my recollection, for any reason. It flashes different colors, but never solid on any one color.
When yours used to come on while charging, what color was it, and was it solid or flashing? Did it change from one color or state while charging to another when fully charged?
I did miss the lights on the D1 and D2 to confirm the plug was in and successfully connected. An added layer of security in my opinion.