My M-990 stopped working in quick start mode. works fine in custom mode. After changing batteries it asked if I wanted to take a test pic? I selected yes...it then locks up with the 5 on the screen. when I slide into quick start the unit just goes black and no 30 second count down. If I put it in custom mode it takes test pic. them it goes into the 30 second count down. why wont it work in quick start. otherwise its fine in custom mode. Software issue?