1. bug

Unable for colonists to settle on forest (english and portuguese probably also dutch and spanish)

Load game
Choose english or portuguese
Research Printing Press
When done build a colonist
Move the colonist to a forest title (no adject cities)
Press b for build city/colony (the build icon isn't there either)

Bug? Colonists can build cities on hills, so I don't think it's a gameplay choice.

2. bug

Game crash the turn after defeating spain (while trying to verify bug #1). This bug might be more general for this scenario.

Load game
Choose portuguese
Invade all spanish cities (takes a little time on warlord might be impossible on sid;))
Press enter (for end turn) when you have conquered the last of the spanish cities.
The game shuts down like when you have confirmed C - q command (quit game).

I know it might not be the propose for the scenario, but they pissed me off (sorry for foul language), besides they started ;).