UPDATE
For those of you who have problems with corrupted images (in-game, not in previewer), I've found a solution. Apparently, there was a texture name attached to some material entries that was overlooked. I believe this is used to 'decal' some textures on top of others when generating a material.
To find out if a particular model is affected, all you have to do is look under the 'Textures2' node. If there are texture references listed, then there's a good chance it will screw up. HOWEVER! This does not happen all the time, for instance: if a model is the only file in a bres node, or if the bres file size does not change.
The problem has been fixed, and post-processing now re-links the texture name. Here is a screen of the entry:
A special thanks to everyone who submitted files for this issue!
On a side note, the collision encoder is complete and the box selector is coming along well (hooray trig!). I've also found a solution to some of the rendering problems concerning flicker (silly fix really). I hope to have a release this weekend.