[URL=http://imageshack.us/photo/my-images/560/screen28.jpg/][IMG]http://img560.imageshack.us/img560/115/screen28.th.jpg[/img][/URL]
As you can see, the upgrade has already been researched but it is still available to click on again. When I clicked on it again, it gave me "order invalid" or something like that.
Commit 7b8a7e