If its super time sensitive, try contacting Luxion support directly, they'll help you faster than in the forum most times.
One thing you can try is fix all of your materials, then Export a Keyshot Package (.ksp). Then import the package back into a blank scene and see if the materials come in properly. When you save a package it bundles all the materials with it, whereas saving a normal .bip does not. It does take a little longer than a normal save, but might help. Worth a shot anyways.
Also make sure that your textures and stuff are in a folder that Keyshot has mapped in your preferences. Not sure if this will make a difference, but won't hurt to try.