Cannot Sync 2nd Gen iPod Nano

My 2nd Gen iPod Nano isn't syncing with Rhythmbox, Banshee, or any other music program. My computer will see the iPod and mount it fine, but only as a Read-Only drive (so I can't drag files onto it). In Banshee, for example, it will see the drive, but none of the sync options work, and I can't drag music files from the library onto the iPod.

I could really use some help, and if anyone knows anything, that'd be great. Also, if you need more info, let me know. Trying to move everything into Linux and this is really the last thing I want to work to make the move final. Thanks.

Oh, and I originally set up the iPod on a Mac. Is that the problem?