I'm seeing the same thing others are reporting regarding the lighting button with the new firmware on the Glo. I think the lowest setting may now be lower than before(that's completely subjective), so my workaround is to crank the brightness up to one higher than lowest so the light button functions normally -I was using it on the minimum setting before the update. I think it'll be interesting to see if the lowest setting seems more comfortable in the dark now, or if we're all experiencing the King's New Clothes here with a little wish fulfillment thrown in?
KOBO DEVELOPERS: REAL Code Monkeys make entries in the change log...

C'mon, just tell us what's been fixed you Kookie Kobo Koders and we'd know if the light was dimmer!