Okay Fellow Bloggers, Help Please!

So I was trying to change my blog layout and whenever I click on Template Designer to go in and mess around and look at templates, I get nothing. Just a black screen that looks like it's "thinking" and trying to bring something up but nothing happens. I try clicking refresh and I still get nothing to come up. It's like my entire Blogger Template Designer is blank. Not quite sure what to do. Any advice from where to go from here would be VERY helpful! I clicked on a basic template to hold me over until I can personalize it some more.