I ran into this problem with v0.9 while converting from wavpack+cue to mp3 using LAME. I was converting 120 albums at once when it stopped halfway thru with the following error: "Error flushing file (Object not found) : file://<filename>" It reads thru the first track and writes out the temp file before throwing the error. I was able to skip the album in question and finish the rest of the albums without further incident. Going back to look at the cue file, I noticed that the genre field was incorrectly set to "misc"...something that came from CDDB that I forgot to correct. To make a long story short, the genre entry was invalid so changing it from misc to rock fixed the problem.