I've run into a weird bug lately, where XPression Designer is not rendering materials correctly. This is isolated to Designer; Studio, BlueBox, and Studio SCE have no trouble with it.
I've got an image that shows the incorrect render:
http://imageshack.com/a/img19/4034/c63c.png
This is not isolated to this one material or object. It happens randomly throughout the project, sometimes on 3D models, sometimes on quads. Not a particular type of material or shader, either; image, video, reflection matte, etc. Text is pretty much left alone, however.
Any ideas?