Homebox configuration screen requires saving twice before having an effect

The first time you change the options on the Organic groups Homebox admin screen and click Save configuration, your changes are apparently not registered - not until you save your options a second time.

I have a very fresh install of Drupal 7, I created a couple OG content types and a test group, as well as a test Homebox page. When I choose my test Homebox for the Override group homepage setting on this options screen, click Save configuration, and then reload the sample group I created, nothing has changed in the group - I still see the group summary for the default landing page rather than the expected Homebox. I have to go back to the options screen and hit Save configuration a second time before that setting has any effect.

The same holds true for the Add a group tab option on that screen.