Werner Kaelin

I was using the free switch version. When I tried to convert a large 29 hours M4B file to MP3 the conversion always stopped at 2:06 h and some odd seconds. I bought the registered version with the same result whether I changed the MP3 encoding with 128 kbps or 48 kbps or renamed the .M4B to M4A or not. I could not find any clue in the Help files about this limitation. Please explain and help! Thanks