Messages (Yosemite) not receiving pictures

After upgrading to Yosemite, I lost the ability to see pictures previously sent by me (from either MacBook Pro or iPhone), or pictures sent to me. This applies to both general non-imessage texts and imessages alike. Instead of images or movies, something like, "IMG_1846" will shown, or video window unable to play a movie. I can still send pictures and video from my mac, and as long as I keep the Messages turned on it will be viewable. However, if I open Messages at a later time these videos and pictures will be no longer viewable and will displayed instead as "IMG_xxxx" or the broken video frame I described.

Upon clicking "details" at the top right of the Messages app, instead of a gallery of pictures and videos I see the generic photo previews that show a page and the file format written on that page (the same as if you download something partial, and it is unreadable but still has the formatting suffix).

I can still view everything perfectly on my iPhone, and have experienced no problems on that side of things.

I have tried simply logging out and logging in again, but that's done nothing. It should be noted that I did join in the beta test for Yosemite, but I don't remember having problems with this until the official release was made. Messages also worked perfectly on Mavericks for me.