Switch was working just fine-- but it continually failed to convert 2 files. After a half hour of repeated attempts, I discovered that the disk was full. Oops!
The symptoms were an output file of 1K or just a few K... but no other error messages.
It would be helpful if the program gave some hint that it couldn't write more data; perhaps do a quick calculation before conversion to see if the available space for the converted files is sufficient. I realize that some conversions can only be approximated, but even a message that "You may not have enough disk space for this conversion" would be helpful!
--Paul E Musselman