Changing the visibility of the "Site Info" tool in Site Info's own Tool Order area causes it to immediately move to a blank page. This only seems to happen when Site Info's visibility is changed, not other tools.
- Go to Site Info.
- Click on Tool Order.
- Click on the "gear" icon for Site Info.
- Choose "Make tool visible/invisible"
It will immediately go to a blank page.
Tested in Chrome and Firefox on 11.x and trunk.