I don't know if this is a bug or not because maybe it's intentional?
I have a USB memory stick with an ISO in the root directory and thus it's deteced by windoze as a CD drive. I noticed that imgburn does not exclude it stick in enumeration and it shows up in the Distination dropdown box as if I could read or write to it. Can't of course. Maybe it's just on my system?
If it's not intentional and this is happening to others, I know a way to exclude these types of USB sticks during enumeration. If you're interested let me know.
bilm