So, I've reached at the final stage of MQ "Dragonslayer" and after coming out with the 3 heroes,
used the Clear Sky shout the first time dispeling the mist in front of PC but the mist doesn't come back with Alduin's fog shout (weird).
There were fog everywhere else that doesnt dispel but not on the field the PC and the heroes are supposed to clear.

After many tries, I've passed the 3 or 4 times Clear Sky sequence. But after that, the main issue : ALDUIN IS NOT SHOWING UP and
i can't end the Main Questline until now!!

So that's my question: Is this a bug or glitch because I miss something before coming at this stage?

I've got already the last Skyrim 1.5 patch and wonder if you guys have the same situation like me.
If you've solved this problem and share the solution, I'll be very much appreciated.