That is probably not the issue. In chrome, open up developer console (F12, then click "Console"), then click the login button. See what it says, and paste it.
This is a known issue, you need to enable GD on PHP.
Try looking at this link:
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Update 5/1/14: Fixed an issue that I found today, which should help some of you out. The banned maps page now allows you to delete map ids. I entirely replaced the jQuery and PHP implementation, so it should be a lot easier to understand and maintain in the future.
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