you are using some mismatched versions of mojoPortal and Form Wizard Pro. we changed from using GreyBox to using Colorbox. You might try setting IncludeGreyBox="true" on the <portal:ScriptLoader in your layout.master file of your skin.
However it is difficult to help since I don't even know what versions of mojoPortal or Form Wizard Pro you are using or whether they are even compatible.