Robert,
I do have some progress. I've found that I can get my image service (CCCP_Demo) to load and work correctly in GeoPlanner when I use a web browser other than Chrome. I installed the latest Chrome update with no luck. Have you heard of Chrome versions being an issue with GeoPlanner? This might be a hurdle using this tool for a current project, as we will have several different users relying on GeoPlanner's functionality.
Thanks again for your help,
Charlie