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Andy,

I've run into a similar problem using the optics2glazedb script to create a custom glazing database. The problem is in the name that you give to you system in optics. Both the optics2rad and optics2glazedb programs parse the Optics exported file for *_glass, *_back and *_front in a way that causes it to fail if you have any underscore ('_') characters in your material names. If you edit the file exported from Optics so that the material names no longer contain the first underscore it should work.

for example:
void BRTDfunc Existing_TruVue40_front
becomes:
void BRTDfunc Existing-TruVue40_front

Best,
Andy