form calculations don't work, calculation boxes grey'd out
I'm new to creating forms, but have a pretty weird issue. I cant add basic calculations to my form. I am trying to sum multiple other form fields and am able to select them with the checkbox, but nothing shows in the calculation box after I've selected them. I've tried re-creating the form with no luck. The link below is the file in question. Any help would be greatly appreciated.
https://drive.google.com/open?id=0B3wAB3cox8TKajRpdEVROGN1alJaYXA5VmJPM1k5WmFVYnRz
Thanks!
