I would actually prefer accomplishing this via Python if for nothing more than the ability to better trap errors; however, I don't think it's fair to impose my preferences onto you, so bear with me and l'll try to troubleshoot this with you.
So let's try or check the following:
- you have verified the test data is already set up to run, inputs and outputs and nothing is locked, correct?
- you have results on the 1st round of execution, correct (Franklin County in your example)?
Be aware there is also a 'Copy Raster Catalog Items' tool - so why not try breaking up the problem by 1st using 'Workspace to Raster Catalog' and see what results you can produce in loading a single catalog, doesn't matter what you name it (or even what you load it with at this point).
Also, are you able to retrieve any error messages so far?