That's a known issue with Motorola Android phones. I had the same issue with my Droid and it drove me crazy until i figured out that I had to lock and unlock to get them to work.
Same problem. Hoping a software update will fix this. You think they would have fixed it in the last update. I hate not being able to see the buttons when its dark.
you should change the title to hard keys not lighting up. I've also had this happen. Though because they are physical keys the light isn't as necessary
Not always.... there were times when it was pitchblack and they wouldn't light up. After switching from froyo to apex they always light up now. My room is bright right now and they are lit up at the moment. I still think it was a bug in froyo for certain people.