Thanks again Magpye. I will have to familiarize myself with this method. Under my Workflow\Compiled folder, I see a lot of random named subfolders - thankfully the timestamp helps find the right folder. If I understand you correctly, I would simply have to Delete the most recent .xaml file - since that would have the change that did not work - correct? The Workflow would then use the next most recent?
What I ended up having to do was Rename the 'bad' workflow. Then Edit any other Workflow / Subroutine that was referencing the 'bad' to use the restored.