Sorry about that - space cleared...
While doing the screenshot stuff I came across the code that reads in the Flags and Ints values from savegames - so I'll try to correct the game day value in the Museum save that Shantih uploaded. We'll see if it's enough to fix the endgame...
Edit: Well things have certainly changed in Auldale...I haven't played beyond the start but everyone who was affected by this bug should hold on to a Museum save if they want to finish the game properly. (No promises but things are looking good).