I started as America in the GC v 1.03. Shortly thereafter I declared Colonial war on the UK. I took all of their Canadian colonies, about 6 - 12 months after I took the last UK colony in North America the Brits came along and offered me a White Peace, which left me in control of all of their colonies. I then moved my troops West to sit on the Russian Colonies in Alaska, as soon as they were all complete I declared colonial war on them and took their Alaskan colonies. About 6 months after I took those colonies the Russians came along and offered me all of Alaska and they threw in the Kuril Islands as well.
From what I can see there is no problem with the colonial war part of the game.
I did run in to something funky in my colonizing. At the beginning of the game there are 2 provinces in Alaska that are not under colonization so I decided to be a bastard and stuck my own Trading post into Alaska, well lo and behold about 2 years later I check my progress and my trade post had somehow become Russian???
Add'l, Am I missing something or if you build 1 of each of the 4 colony buildings you should be able to claim a colony whether any other power has a claim or not? Is that right?
One other thing, I am trying to finish off the colonizing of Canada and the Brits didn't bother to build any coaling stations so I stuck some on those Lakes thinking that it would give me the 4 bldgs I need to claim the colony but no it didn'twork that way? Shouldn't it have worked?