I don' t think it' s an Image problem , maybe something went wrong when flashing .
I have 3 DM 500-S with Marven 1.0 - 2.0 - 2.2 all working properly .
I suggest erasing and flashing via serial cable and DreamUp .
Look at my thread of 23-12-2011 :
http://www.sat-universe.com/showthread.php?t=222862
Hope it helps .. :thum: