I add the Formula field to my form.  I try to change the name of the Formula field and try to add a calculation, but the new name and calculation do not save.  I see an AutoSave popup window flash, but when I go to access the application and back to the form builder the Formula field goes back to the title "Formula" and the calculation is empty.

I've tried to delete and add it again....sometimes the Formula field just says adding.... and never shows on the form.