The popup for the 'leave a comment' is showing up behind the links at the top of the page:
All of the following screen shots are from a mac.
Original report in Safari:
Fresh install of Firefox:
Current (31.0.1650.63) version of Chrome:
Current version of Safari:
I've been able to reproduce the safari issue on another mac. However, the larger monitor (larger window, the delete dialog is further down on the page) means that I need to grab and pull the review pane window up so that the links at the top of the window.