We nailed this issue down. Discovered it has to do with the 'auto-level up' feature with the base game. We mistakenly added px2 abilities to certain characters progression tables when they auto-level up that they do not have access to. If you disable this feature in the options menu you can bypass the bug. We are however trying to get a fix, though I have no exact date when it will release.
Sorry
-Sking
Disabling that setting seems to fix the issue of adding and switching party members. However, it seems like it spawns a Hiravias clone in my Caed Nua map (both outside and in Brighthollow). I haven't checked other maps yet. You can talk to this clone Hiravias but he does not move. It also creates a marker in the map with the name Hiravias in it.
Also, the Hiravias that I add into my party is missing all his items and goes back to the default armor when you first recruit him.
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Game breaking Bug - Cannot change Party (3.03)
in Pillars of Eternity: Technical Support (Spoiler Warning!)
Posted
Disabling that setting seems to fix the issue of adding and switching party members. However, it seems like it spawns a Hiravias clone in my Caed Nua map (both outside and in Brighthollow). I haven't checked other maps yet. You can talk to this clone Hiravias but he does not move. It also creates a marker in the map with the name Hiravias in it.
Also, the Hiravias that I add into my party is missing all his items and goes back to the default armor when you first recruit him.