Well so far I'm not having much luck figuring out why it doesn't work. I've looked over the code and everything seems ok, but I'll play with it a bit more tonight.
For now you can just turn it off, or you could edit out the temperature parts (though in my opinion that's one of it's main features). Maybe I'll figure it out or someone will post a fix in the original thread soon. If you decide you want to uninstall it, you can just upload the myvbindex_uninstall.php file to your admin folder. Then you would go to http://yoursite.com/forum/admin/myvbindex_uninstall.php
?step=3. That will remove all the weather templates and database fields. Just be sure not to do that unless you're positive you want to uninstall it because there won't be a conformation screen and you'll have to re-do everything for the weather if you decide you want it back.