I removed all javascript and am still having the issue. I've also checked the frame source for errors and there doesn't appear to be any.
The issue is only on the root document that has the master template applied with the home template set as the default template in the page place holder. When I create a page and give it the home template I am able to remove the widgets.
It may be a bug. I switched to an empty default master template and have the same issue.