There is a known issue when using the SQRT Function in a variable equation if the cascade MDL rule is also checked.  The function is intended to report the square root of a number, however, in this case it returns the number itself, not the square root.

Symptoms: 

Solution:

Instead of using SQRT(V4725) use SQRT(V4725+0)

If you use SQRT(C4725+0) and Variable 4725 is blank then 0 will be returned.