Playing with fire bug, it could be mantle.
Ok so i started this quest (playing with fire) and when i got to the statue where you have to run around it 3 times clockwise it would never trigger the grandfather to appear and i ran around this st...
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I have the same GPU and use Mantle. No issue at all.
For 2 of my characters (dwarfen warrior & human mage) the grandfather event wasn't triggered either with millions of tries.
The third runthrough (human rogue) had luck and was capable of triggering the event properly without any issues.
Never identified the possible cause.
