I'm pretty sure I'm not banned and I hope I'm not but here is what happened.
I was in a lakeside lobby and I alt tabbed into TF2 to play man versus machine. When I alt tabbed back to my browser (Google Chrome) the lobby page was blank with a retry button and it said in the top http://rc.tf2center.com/banned. I thought that I was banned and I couldn't open up any TF2 Center pages and all it gave me was that same page again and again. I went into google chrome in an incognito window and was able to load TF2 Center pages again, after that I went back to my normal google chrome browser and it let me go on normally. So idk what happened, TF2C did go down at like 1:41 wich is around the time this happened so that might have been the issue.