Steps to reproduce:
1. In Add Event: going back from Source to Metadata shows an empty page
2. In Add Series: going back from Access Policy to Metadata shows an empty page
3. In Add Theme: Previous does not work at all.
Workaround (if any):
re: 1 clicking previous on the source page seems to take you to a phantom page. If you click previous again it goes to the metadata page.
Looking at the (massive) urls for these navigation issue can shine a light.
The previous button on the source tab take you to a metadata-extended tab and not the metadata tab
The Theme wizard uses a different mechanism for prev/next than the event and series wizards. They also have different modal files according to action ie create, edit. Whereas theme combines these into one file which may be the reason for the variation in coding style.