Extra "select all rows" checkboxes added when no action selected

I just installed the VBO 1.0-beta1 release on a clean install based on the Drupal.org testing profile. I also have installed Views 1.6 and Actions 5.x-1.x-dev.

Here's how I reproduced the bug:
1. I enabled the default 'tracker' view and set the View Type for page to Bulk Operations View.
2. I then enabled the action_node_unpromote and node_operations_unpublish operations for this view.
3. I viewed the tracker view.
4. I selected the "select all rows" checkbox.
5. I then hit the Execute button *without selecting an operation*.
6. The page returned gave me a warning: "No action selected. Please select an action to perform." This error is expected, however I also notice that I now have two "select all row" checkboxes, and the second has replaced the header text that previously said "Type".
7. If I again click Execute without choosing an operation, the Title header text field is now also replaced by a checkbox. This happens to each successive header field as I click Execute again and again. The attached screenshot shows how the page looked after hitting execute 4 times without selecting an operation.

On an additional note, after this happens once or more, none of the checkboxes in the header row appear to function as "select/deselect all rows" checkboxes. Checking/unchecking them seems to have no effect.

Clearly I'm doing something I am not supposed to be doing (that is, clicking Execute without having an operation selected), but I suspect that the addition of checkboxes is not intentional.