>Interesting. So what would make a DLL perform math functions differently than a regular function call?

You got me, Fred, I dunno. Or as the Marquie deSade's girlfriend said when asked why she stayed with him, "Beat's me!".:0)

Seriously, the fact that I've been able to independently replicate it shows that it's there. At first, I thought it might be something to do with integer math. One of the tables contained two integer fields that were multiplied by one of the functions to return the result. Changing them to good ole numerics didn't change the result. So as the politician said when asked where he was when out on the campaign trail, "I'm stumped!":-)