Google Maps Embed Code Disappearing

When I try to post a Google Fusion Table html embed code into my wagn site it doesn't show up.

On my desired page I click "edit html source", paste the embed code, click "Update" and the map appears - everything looks fine.  Then I click "Submit" and the map disappears.  I go back to "edit html source" and the code I entered has disappeared.

Thanks for looking into this.  I'm really loving wagn!