I was shooting today with my 645DF+ and IQ160 and after around 6 hours shooting, towards the end of the day's shoot, I was getting an error message "CAP DB" and the camera (1) stopped triggering my flashes (I was using an Elinchrom SpeedPort on the flash hotshoe); and (2) did not seem to respect my shutter speed setting whilst in "M" mode.
I changed the batteries in both the IQ160 and the 645DF+ and tried both tethered and un-tethered shooting but I was still getting the error message though weirdly if I changed the mode dial on the camera from "M" to "Tv" the error message disappeared and the camera would fire respecting my shutter setting and the flashes would trigger.
Can anyone help with any suggestions as to how I fix this problem? I have another shoot tomorrow!
I have uploaded a video to YouTube to show the error message: http://youtu.be/5likC1JsFDg