Title: Image pattern module bug

Text from bug tracker:
See http://icrashedtheinternet.com/scatteringTestScene3.aoi
In the scene linked to above, the texture "emissive screen image 1" appears
completely transparent when you first load the scene. It shouldn't be, and
to make it show up you must open the texture, open the image pattern module
in the procedural editor, then close it all again. Then the texture shows
up as it should.