Well, I attempted to send an email to Trendy but apparently the support e-mail adress is deleted, so I'm going to post it here instead.
To sum up the extremely long e-mail I made, I bascially was playing on TrendyNet on a person's server when I got BOSDed. I tried and failed to open the .DMP file left over to see what the problem was, but eventually I gave up and started up Dungeon Defenders again, and to my suprise I found this:http://steamcommunity.com/sharedfiles/filedetails/?id=166186401 http://steamcommunity.com/sharedfiles/filedetails/?id=166186256 http://steamcommunity.com/sharedfiles/filedetails/?id=166186039
As you can see from the screenshots, the GUI is there, as well as the music, but there's no background. On the character select, it changes rapidly from diffrent colors from the character (Ex. If your character has blue, red, and yellow, it will change from those colors, as well as the colors you can't change [I will see if I can make a GIF of it later]). In game, it shows the GUI and plays the music but no graphics (it doesn't show the map itself).
I plan on uninstalling and reinstalling DD later, but I thought I might post this anyway just to inform Trendy if they needed it.
EDIT: GIF of the character selection glitchhttp://fc05.deviantart.net/fs70/f/2013/214/8/0/ddglitch_by_quickfemaleninja-d6geek3.gif
EDIT 2: Thank you Avous! :)