Re: Why is Blackwall unavailable?
In my play throughs so far, his major personal quest appears to be tied to the completion of Wicked Eyes and Wicked Hearts, as well as the completion of a romantic storyline.
Spoiler
Spoiler
IIRC, If you side with Duke Gaspard at the Winter Palace, and you have not romanced him, Blackwall dissappears upon returning from the party. Otherwise, if a female Inquisitor is romancing him, talking to him after the Wicked Eyes and Wicked Hearts quest eventually triggers a romance scene, after which he pulls his disappearing act, leaving a note behind in the stables. If a female Inquisitor is romancing someone else, then committing to another character after WE&WH seemed to trigger his dissappearance. A messenger will appear in the stables.
So, while you may have delayed it with your re-load, eventually he will disappear again.
