I don't use Tapatalk, but I do know that the forum software hasn't been altered during the last month - did yout Tapatalk update itself? Could it be a case of the forum needing to update to handle the newer clients?
When I search navara Asia on my phone it gives the option of opening it with tapatalk. Perhaps give that a try. Also check that you are logged in. Perhaps you need to sign in again after an update or something??