—: In r69, auto-mirror option has been removed in favor of set mirrored/not mirrored actions.
Please keep updated to the very last version available.
More over, it has been documented several times that "file preview" mode didn't allow mirroring/flipping and other actions like sound playing in certain browsers.
Please be sure to search the forum.
And finaly, being in the bugs part of the forum, be sure to check how to report bugs first next time you feel you need to report a bug. Your "report" as it is is far from complete and on a "legit" bug report wouldn't be of much help.