Sorry I'm a bit late, but I think this was perhaps due to encoding of the metadata. UTF-8/Unicode information should display pretty universally but, in my experience, ID3 tags don't support it well and downloaded MP3s rarely use it anyhow. Seems like everything's fixed now anyway, but just for posterity. :)
Please be sure to report any other bugs you find with Banshee/Ubuntu!
Sorry I'm a bit late, but I think this was perhaps due to encoding of the metadata. UTF-8/Unicode information should display pretty universally but, in my experience, ID3 tags don't support it well and downloaded MP3s rarely use it anyhow. Seems like everything's fixed now anyway, but just for posterity. :)
Please be sure to report any other bugs you find with Banshee/Ubuntu!