Thanks for the provided scene and sorry for my late reply. I can confirm, that this "Division by zero" bug with expressions has been already fixed in the RC3.
"... the uvw calcs aren't working right, so I assume it isn't calculating out right at all ..."
Operator seems to give correct values for the UVW XForm
Operator, but because of the Scale
mode selected and bevelling applied, these are "distorted".
Please feel free to describe more in details, how the final style should look like. Thanks in advance.