‘Unable to find’
usually means that you have another application moving a file since it was opened in Jaikoz. This can most typically happen if you have Jaikoz editing files under iTunes control and you have iTunes configured to rename files based on their metadata, so the first time you save the files in Jaikoz their modified metadata can cause iTunes to move/rename the file and then if you try and save the file again in Jaikoz it cannot find it.
'Unexpected Exception reading file…"
This should not happen if there is a problem with the file Jaikoz should handle it better. I would need your support file sto investigate further.