"- Player thinking lights are on/off randomly and setting dimmer to suit. This is probably over-sensitive detection of the glitches on the headlight sense line and we can probably do something about it in the player. Can people suffering from this please describe their setups? "

I have never used mine in the car or used hijack to adjust the dimmer, but sometimes the boot-up is dim, sometimes bright. Sometimes it plays dim, sometimes it plays bright. I have never seen it change brightness without a reboot (except for when going from boot-up to playing). I have only seen it change after being rebooted. Remember that bug in beta 7 where the player would reboot itself when switched to the seek tool? Everytime that I can remember that that happened to me (which was quite often), the player would come up dim after the reboot. It was an expected and consistent thing. Perhaps you may be able to gather a few clues from that.