I went way back (losing a lot and tried again) doing things different still CTD.
Potemic (I think name is) the second part under the solitude chapel. Right at her death as she swirls about and flies for the door- It CTDs. I`ve narrowed it right down to exactly when the doors open.
In my 48 hours trials, I noticed that disabling AVG delayed this crash slightly which is weird, so I disabled all firewalls, crappy Steam off, etc, etc...but as I got close it still happened.
It`s either a Mod which has somehow totally conflicted with this one thing in my many quests and many hours of playing or its a bug in 1.4. It`s hard to say which because I removed all mods and tested, but something might still be residing there and of course with Steam I can`t try an earlier Patch to test that!
If I could try the previous Patch like I would have before then I could confirm if it was a buggy Patch or not- Now I can`t. Thanks Steam and Beth. can`t even fix problems myself cos you tie my hands.
Everything else i`ve been able to try I have. My only solution is to wipe the whole game and reinstall, but frankly I can`t be bothered. When I`ve put loads of hours into a game I tend not to go back to it for a few months at least. I don`t like games screwing my precious time. I`ve left my report with the Tech guys in their thread (in a somewhat annoyed manner due to tiredness and frustration). maybe they`ll figure it out but I doubt it`ll happen soon.
I actually stopped playing Dragon Age for Skyrim so now I`ll go back to that.