Messages Not Working

So, sending and receiving private messages have been not so great lately. Whenever I find myself writing long messages, I notice that it logs me out in the middle of it, making me unable to send messages.
Also, I received a message today, but it refuses to show me what is on it, but logs me out every time I press on the message. It shows a blank message like this:

Logs you out? The only way that would happen is if something is clearing out your cookies. I haven't had a similar experience; has anyone else? Also, your image may be private; I can't see it.

Maybe that's it, I have a lot of cookie blockers on my computer, but why would it happen only with messages? I can't seem to get the picture up. I uploaded it privately to facebook, but I think it should still show up here.

If the photo is 'Private' on FB, GP will not be able to access it. And neither will anyone else who isn't your FB Friend.

I'd either host the image on imgur.com or postimg.com if I were you.