Blank page upon commenting

Hello, I just installed wordpress last night. I’ve been messing around a little today but I noticed that when I tried to comment, a blank page appeared and no change was made. I noticed it only does this with my admin account. I posted a comment as a random person in and the comment was successful. Tried in both IE and FF. If it makes any difference, I’m using a theme called blue-mist.
Why would this happen? Does anyone know how I can resolve this?
Thank you!