If you add a page to a block it results in the following javascript
Y.on('click', window.open('http://moodle.domain.com/mod/page/view.php?id=48&inpopup=1', '', 'width=450,height=450,toolbar=no,location=no,menubar=no,copyhistory=no,status=no,directories=no,scrollbars=yes,resizable=yes'); return false;, "#onclick5604cdaa89bc63", null);

This stops any of the Block Chevrons, Block Cogs and User Profile Drop Down Menu from being clickable.