AbsintheRed
Deity
@ Absinthe
My bad. My observations did hint me to that direction. Some testing did made me think I was right.
No prob, and thanks for trying

Spotted the problem. In the XML, it is defined in cannot be build after turn 150.
Code:<iCannotBeBuildAfterTurn>150</iCannotBeBuildAfterTurn>
I thought I remembered something like that in the game - to prevent Vinland being built as one of the colonies for England, France, Spain etc IIRC, and to prevent them exploiting it to get timber.
I believe it was set as turn 150 was when the Viking UHV originally checked. Maybe it should now be set to not being buildable after Norway UHV2?
Ohh, I didn't remember we had a that close cap for that in the XML too

Seems rather redundant, as the Access resource is already disappering (currently in 1250, was 1050 before the Norse split).
At least redundant before Astronomy, when the Atlantic Access resources appear.
Anyway, I definitely plan to separate that UHV into a colonize Vinland part (till 1050 or 1100), and to the conquering part (in ~1250)
The XML cap can stay anywhere between the 2nd UHV's Vinland part and 1500