Yes there is an issue with the calculator. Vicky was working on it, I think yesterday to add a help file to it as popularly requested. Unfortunately when she saved it down to the site it seems the calculator got jacked in the process. I'm checking my local archives here at home (I tend to save down copies of site components like the calculator just in case) I'll take a look and notify JamesP about the situation.

Thanks for the heads up,