Add me to the count also! MK2a sn# 040104150 running 2.0b11. I've had the player for almost 2 months and just noticed the problem earlier this week after running 2.0b11 for several weeks.

Without making ANY adjustments to the unit, sometimes display is very bright (100%) when I dock the player in my car after work and sometimes the display looks around 80% ish.

After discovering this thread I decided to dock my player in the car and have a look at it (I've been listening to the player for a couple of hours in my office) and the dimmer seemed to be VERY dim. I checked the dimmer setting and it was at 0%!

Perhaps it is a temperature issue?

-Chris