Problem: Adblock Plus causes direct .swf links (that open in a new tab) to not always be displayed properly unless the browser is refreshed. Tested with all other plugins/exetensions disabled (except flash) and tried with a non-built-in version of flash.
Version(s): 1.0.26 and 18.104.22.1687 (newest beta at time of post.)
Reproduction steps: Install Adblock Plus extension, enable EasyList. All other extensions are disabled. Go to a link for a website that opens a direct flash (*.swf) file such as this. You should see a blank page, if you right click it, you will get the message "movie not loaded." Occasionally file will show properly and preload as intended. Go to extensions and disable Adblock Plus. Go to link, file should now open and load normally. Turn on Adblock Plus, it will fail to load properly again.