'Reload Notes from Storage' button not working

Zeppelin is configured to use a remote git repository to store notebooks (
zeppelin.notebook.storage is set to
org.apache.zeppelin.notebook.repo.GitHubNotebookRepo), as well as read from a local git repo (GitNotebookRepo), zeppelin.notebook.one.way.sync is currently set to false.
 
External changes to this repository (notes added, deleted) are not reflected in the the UI, regardless of the combination of the above values. And the 'reload from storage' button next to 'Notebooks' on the home page does not have any effect.

Making commits on the notebooks appears to do a pull from the remote repo and update the local repo on the file system in the notebook directory, however these changes are not reflected in the UI.