Artist information lost when updating information

Hi,

this one seems to be a harder problem...
When switching to Dharma respectively RC1 my music fanarts have been lost. I tried to gather them by updating the separate artist information. For most of the artist I got new fanarts but at the same time the artist informations have been gone. Gathering/updating the artist informations for all artists did not help?!
Does anybody have an idea how to get the informations back? A fanart is nice, but to loose the artist information for getting fanarts is not that nice:confused2:...

Best regards,
Ogi