I didn't make it!
I downloaded some of the new maps from this site and have no luck getting them to run. The original maps work fine but when I try to open any of the downloaded ones, everything seeems to be loading fine until the task bar reaches 100% and the last thing I see at the bottom is "verifying client data" and then the game music starts to cut out and it closes the game. Please let me know if you can help, these original maps are have gotten old
Try changing your terrain detail level to medium or high, a lot of the custom maps won't run with it low.