It seems I ran into a defect on removing tags. Had a few tags I wanted to remove from a few apps, and anytime I went to remove a tag I couldn't save any changes so the tags remained. In other words, the Save button doesn't enable itself for saving the changes when a change is made in the tagging feature of the app.
I was able to work around this by removing the tags, then adding and removing a space from the Label field, then the Save button was enabled and I was able to save the changes.
This is on version 5.0.4.