Safari cannot load any Google Sign in pages
I'm on a late 2011 Macbook Pro 13" running 10.10.2 with Safari 8.0.3. My internet connection is fine, and I have no problems in any browser but Safari.
Safari will load any webpage fine, until I try to access a Google page that requires logging in. This includes accounts.google.com, mail.google.com, calendar.google.com, etc. Google search loads fine.
I've tried clearing cookies/cache, completely resetting Safari, resetting my keychain, and double-checked my DNS settings. Nothing has made the progress bar move. I've of course restarted countless times as well.
The problem arose when I tried to install the desktop version of Google Drive. Once installed, it displays a blank window as the sign-in page, and won't let me do anything but close it. I found a ton of similar issues on Windows and IE causing Drive's problems there, so I'm thinking this is a Safari issue at heart (or maybe Keychain, since it all routes through there apparently too).
Does anyone have any other suggestions?
MacBook Pro, OS X Yosemite (10.10.2)