What version are you running? release-2.5.x What's the URL of the page containing the problem? Any requests where belonging to the logging in user (https://reviews.reviewboard.org/r/XXX/ What steps will reproduce the problem? 1. Go to a review, logged in as the creator 2. Go to 'Add File' via 'Upload' menu. 3. Click 'Upload' without selecting a file. What is the expected output? What do you see instead? The button should be disabled, and enabled after you select a file. The button is enabled, and error messages show up when clicked. What operating system are you using? What browser? Xubuntu 14.04, FireFox 36.0.4 Please provide any additional information below. If added, should also be adjusted for File Provider framework if it is around.