It stopped working right after the Upgrayedd some months ago, when the old forum software gave way to a much newer version.
Highly ironic, this is, since one of the claimed benefits of the newer version was supposed to be better support for mobile devices. And notable, right away after the Upgrayedd, was that support for Tapatalk was gone. It turns out that even using a browser on a cell phone, the new software plays very, very badly with it, compared to the old software, especially when trying to edit a post. It seems that there are some scripts running while you're editing a post, that mess with what you're typing. I don't know what their intended purpose is, but they have very mild adverse effects under a desktop-based browser, and seriously f••• things up when typing on a cellphone-based browser.
It almost seems that, contrary to what has been claimed, that it is an intentional, deliberate effect of the new software to f••• up any ability to post from a mobile device.