Matt meant what type of music file, flac for instance.
Matt gave you the email address to send the report to. Replace at with @ and dot with . and no spaces.
If it is the same issue as I have (crash when pasting cover art to flac files), you could try installing build .173 or earlier because that build works for me. You can find builds to download in the forum announcement posts. Just install build .173 over your current installation.