Confirmed. With that mod activated TP works fine for admins, but is breaks the site for all other users..
This is not something we can easily fix: $forum_version is the key that TinyPortal uses to switch between 2.0 and 2.1 logic. And it is in the TinyPortal code in many different locations, needed to make TP suitable for both 2.0 and 2.1 users.
At this time I would recommend to deactivate the Hide SMF Version mod.
TinyPortal will work fine then.
I personally doubt the usefulness of hiding the SMF version, but if you feel strongly about that, you cannot use TinyPortal...