"I enabled: Enable Question Aliases"
But did you then edit the form and populate the aliases? question1 etc might be the default for unpopulated aliases on an existing form, I can't remember off the top of my head.
alias is supposed to be a shorter version of the question
I'm not sure what version added or fixed it, I think it has not changed in a while. If you can't get it working I suggest upgrade to the latest version of mojoPortal and Form Wizard Pro.