Merged Age problem...

I remember reading somewhere before how to do this but I can't seem to find the post so hopefully someone can give me some help.
While playing I have found/seen parts of some ages left behind in another, sorta like the memory wasn't cleared in a sense. I thought perhaps the problem would go away with a simple restart of the game, but that hasn't helped, is there a way to solve this problem or will a reinstall be needed?
EDIT: I ended up solving the problem, sorta. I don;t know if it was connected or not , but I had a RAM stick that was failing. Once it was replaced URU began to function properly.
While playing I have found/seen parts of some ages left behind in another, sorta like the memory wasn't cleared in a sense. I thought perhaps the problem would go away with a simple restart of the game, but that hasn't helped, is there a way to solve this problem or will a reinstall be needed?
EDIT: I ended up solving the problem, sorta. I don;t know if it was connected or not , but I had a RAM stick that was failing. Once it was replaced URU began to function properly.