No images in preview window

[Neiloch]

For some reason whne i load up UI elements all i get in the preview pane are grids and red box's from highlighting (if their on, otherwise blank space). I've loaded all kinds, custom and default elements and none of them show anything. This happens in both the old version of the UI builder as well as the new one.

Sorry if this has been answered before but I searched the forums and the read the FAQ and haven't found anything like this problem. Thanks for any help.