Picture Messaging Issue????

I have the Moment with android and have had no problems with picture messaging until last week. I can send pictures just fine, but when I receive them, the picture doesn't pop up in the text conversation like normal, it leaves a link to "download" the image. I click download and an error message pops up stating that the process com.android.mms has stopped unexpectedly and shuts down.

What happened? What can I do?

Thanks.