This evening is happened to me too. I was changing the original lens with a custom one, and with the player without lens I have connected it to the ac power adaptor to see how nice is a 'naked' empeg
At bootup, it says "player settings lost" and it lose all audio settings (but no EQ settings hopefully!), time format, time zone, shuffle and repeat settings, dimmer and playlist position.

I am using v2.0b13 w/HiJack v299.