Resolved Question: SanDisk Sansa Shaker Mp3 Player Question!?

I have two Sansa Shaker MP3 players for my kids. They are a great little music play and my kids love them. They come with a 512MB SD card but I wanted to load more music on my daughters so I purchased a 4GB SD card and it will not play.

Does anyone know what the max amount of memory SD card it will accept? Will it accept 1GB or 2GB SD cards?

Thanks!