Login page only works with open in new tab?

So let me give you some background, I’m running wordpress in a sub-directory because I have a drupal blog and I’m essentially using wordpress as a database for a different project, my problem though is I can only log in to wordpress when I right click on the login tab on the home page and hit open in new tab. If I don’t do that (on firefox) it gives me a white page, (on Chrome) I just doesn’t do anything, Thanks in advance for the help guys, Much appreciated. Brendan,