i had this prob. i was stuck on the mobile view for the forum too and i managed to get it solved (at least for me).
a short recap:
1. mobile view enabled in forum settings
2. mentioned it's c*** ... not that good
3. tried to reenter the settings to set it back to default
4. u got the message ... this is not avaiable in mobile view ...ahhhrrrrg!
5. u hit "full site" and get redirected to the main site
6. u press settings and get back to 4. ...double-ahhhrrrrg!
7. u r trapped in a perfect loop!
i managed to escape this circle of death by adding some extras to the webaddress.
for the convenience i did this on a pc-browser but i should also work on any mobile devices and even a mac.
first u need to start ur browser and log into the sts-forum (don't use the forumapp it wont work that way).
after u performed a successful login u pay attention to the addressbar which should say something like:
now u either type this in:
or u manage it to click/ copy'n'paste it. remember u have to be logged in the forum.
if u done everything right u should we redirected to ur holy-forum-settingsscreen.
now its just setting the skin back to SpaceTimeStudios and clicking "save changes" beneath.
i doublechecked this way and can say it's a hundred percent reproduceable (at least for me).
if this was helpful, leave a message.
if u r experiencing trouble, leave a message (i'll see if i can provide further help).
if u didn't liked what u red here, u don't have to leave a message.