Yes, this is because the album image server is currently getting an upgrade. We will be releasing a new version of eJukebox shortly which will
increase the accuracy of the album lookups.
When album lookups yield multiple matching albums, eJukebox will use the oldest album as opposed to the way it worked before were is chose a random
For now, you can temporarily "disable automatic cover lookups" in order to avoid getting error 13. Then grab the upgrade Thursday.