For those that are running the new ModphpBB3 1.0.3 Beta, you must go and update your phpBB version from 3.0.2 RC1 to 3.0.2 stable release. This was released by phpBB tonight.
The auto updater works a treat, as have done it on about 5 so far. There is one file that needs merging which is viewonline.php and it merges perfectly via auto updater. You must download that file, unzip then upload that file, recheck the files via auto update after you replace viewonline.php, and it will say it's done!
Make sure you download THIS VERSION if you are running ModphpBB3 1.0.3 as they are the files you need to update that phpBB version.
Upload the install folder to root, access your updater in admin and follow the instructions.