Hi Greg
You could try the following: Use iLON Vision CS4 to add all the iLON vision objects (with all specific parameters like datapoints, substitiution values ...) you need to your page, but don bother with layout. When you're done with that, safeyour page and quit CS4 (the actual problem is Adobe's CS4, not iLON Vision). Then use a better HTML editor than Contribute to do the layout. It's all pure standard HTML with some custom attributes. If your editor leaves these attributes alone, everything should be fine.
Regards
Thorsten