Dear people of Skyrim and Falskaar,

First of all, please excuse me for my poor english. I'm going to try to explain myself as clearly as possible.
Here we are, I have a little problem at the extreme end of the main quest "The Heart of the Gods". I'm in the heart chamber, Yngvarr challenged me and I put him a punch in the face. Then he runs to the Heart, laughing like crazy. There, something happens, and i just have a second to see a dragon rush on him... And black screen, before i'm in the Amber Mead Inn, with the smiling people of Amber Creek, and Agnar, thanking me "for everything i've done". ...Mmm ...By the Nine, what have I done exactly ?
At first I wondered if it was normal, but the quest is archieved when Agnar ends his thanks and I can read the summary, which tells me everything that happened (and it is very different, now i know the end T.T). And between this time and the time when Yngvarr was going to take the Heart, there's nothing. The image fades to black, there's a loading black screen (with the experience/level bar) and... The Amber Mead Inn. It looks like amnesia :P
This problem seems not to have happened to anyone else. Well I haven't also taken the time to read the other 39 discussions...
So pleeeaaase, I really like Falskaar and i didn't do all these quests not to see the end ! If someone has an idea, it would be great :)
I really don't know what it could be due. I thought to the other mods (I use many other mods but they always worked perfectly and they're loaded in a good order) and I tried to deactivate them all (except Dragonborn, Dawnguard, Hearthfire and of course Falskaar). Results : the last save simply doesn't work, the game crashes and stops just before the end of the save's loading. And for the other saves, there's no change. Still this black screen and my return in Amber Creek in a second, even without mods. It would reassure me to know that this is due to mods but it doesn't seem to be the case. Would it be possible to solve the problem with commands ?
I think that's all. I really don't know what to try and I would like to avoid to wreck my saves. So I hope you will can help me, I'd be happy :)

Thanks a lot, Dragonborn !