Music Store Limits on U/S SSD?

My Unitiserve SSD seems to have just lost it's Music Store so wasn't ripping new CDs. I was able to create a new share on the NAS and register this as the new Music Store and rip to it. I noticed that the original Music Store had hit 500 albums, so I wondered if this was a limit for a music store or just a coincidence?

Anyone know??