Re: Dragon Age II on Mac crashing after Sundermount
I had the same issue, tried all the fixes in this thread to no avail.
What worked for me: Open the Dragon Age 2 app from outside Origin.
Go to User >> Applications >> Dragon Age II (that's where my .app file is installed)
Open up your save at Sundermount and try to initiate the cutscene. Seems like this error is an issue with the Origin client.
Hopefully this works for other folks who are playing the game in 2018. 🙂