Quote: "FPSC test levels don't seem to recognize different materials"
Correct
Quote: "One is the main mesh, with the UV map applied as a material. The other part is a box with a transparent material, like glass.
"
This seems highly ineffective. Try unwrapping the glass part too and give it a transparent spot on the UVMap. You can use a shader effect to give it some specularity in this place. This
should work.
Quote: "Is there a special trick to make the test level recognize materials, just like the editor does?"
Aer you certain the editor notices materials? I've never perceived anything like this.
Quote: "Will test levels and built games in reloaded recognize materials? "
Most unlikely.
-Wolf