When transferring tracks, using the Banshee interface, to my USB drive I was getting an error "Object reference not set to an instance of an object".
While I have a reasonable grasp what the error means from a coding perspective, I don't have the time nor the inclination to dig into the source code. Nor would the average non-coder trying to move to Linux have any idea.
Turns out that a fix found here:
Sorted out my problem nicely.
I added output_formats=audio/mp3 to the .is_audio_player file on the USB device and I can now copy my tunes for the car and I'm a happy raver once again :)
Apparently this is something to do with telling Banshe the device supports mp3 format audio and not to bother re-encoding for the device.