>If the value in Spinner1 is chosen first, then the value of other controls, the value in Spinner1 interactively changes back to zero. what could be causing this?

Put SET STEP ON in the lost focus of spinner. Then step through the code and monitor the value of the spinner. Also, in the debugger you can set a breakpoint on the value of thisform.spinner1.value and the code will halt when the value changes.