Sounds like you have been hit with a Trojan.
The idea behind a Trojan is that you are provided with a login page that appears to be Facebook but is not. When you login, you are really just handing over your login credentials to whoever setup the attack. The problem with Trojans is that they can't completely mimic your Facebook page. They don't have that info. ...which is why the profile pic appears blank.
If you are using a bookmarked url or you are selecting one from your recent history list, I would recommend typing
http://www.facebook.com in manually.
If that doesn't work, you might try loading an alternative web browser like Firefox. (I'm just thinking out loud here, but I would think that if you installed a new web browser that it would be unlikely to be hacked.)
If you get in and that fixes your problem, then change your password IMMEDIATELY.
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