Waterfall_13
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Barbarians don't gain experience from spell-giving dwellings; only the leaders do. Is this intentional? In Fortress, it's impossible to upgrade to level 7 in the 3rd tier.
Yes, barbarians don't gain experience from shrines with spells; this wasn't intended, it's a bug that can't be fixed.
Fortress upgrades everything it can, the question is whether you have enough resources and gold. The 3rd tier is expensive (very expensive).
Added 3 minutes later
Yes, for a completely clean version. Maybe I'm downloading something wrong; I downloaded it from Google Drive using the link from the first post in this thread...
Unfortunately, I don't know what's wrong.