>>But why would it occur on only one machine? Maybe the testing is not being done equally?
>
>We'd need to investigate when and how oChild is getting the property set to a value.

I stept through the whole program in the debugger to see what's happening. This is the sequence I see:

oChild.muGetValue('pnAmount) calls This.Parent.muGetValue('pnAmount')
oParent.muGetValue('pnAmount') has a property pnAmount with value 70. this value is stored in luReturn. When the debugger is on te last line on oParent.muGetValue() (= Return luReturn) luReturn has a value of 70 as I'd expect. When I press F8 I return to oChild.muGetValue. Here I see that luReturn has a value of 24.50. In my opinion nothing happens in between.