Random problem: Can't login with DX_AUTH

[eluser]dallen33[/eluser]
I'm not sure why this happens, but randomly I won't be able to login to my app with dx_auth. Most of the time I can just go to my site, login and it's fine. But sometimes, like right now, I enter my login info, hit submit, and the page just refreshes. It doesn't take me anywhere, shows no error, etc. Sometimes restarting MAMP works, sometimes restarting my computer works, sometimes I just wait and it'll work.

Any ideas why this would be happening?