It seems that this file of yours is problematic, as you said. I do not know why.
On one of my computers (Win7 32B ) the result become zero whatever I change in the input fields.
On another one (Win7 64B ) it cause quite slowdown and (Not responding) messages in the SMath Viewer heading after the first try to change a value in the input field.
I think I can not do anything about it, sorry.
Regards,
Radovan
When Sisyphus climbed to the top of a hill, they said: "Wrong boulder!"