I should have realized the problem sooner, we had changed from using GreyBox to colorbox in mojoPortal 2.3.6.6, so we no longer include that script by default, but Form Wizard 2.6 was released before mojoPortal 2.3.6.6 so it still uses GreyBox. Actually my local copy of Form Wizard has already been updated to use colorbox. So after the next update of Form Wizard you can back out that setting on ScriptLoader as it will not be needed.
I was able to fix the email problem today, I'll make a new package of Form Wizard early next week and post again when it is available. If you need it urgently let me know and I could package it up quickly and send it to you today.
Thanks for the beer!
Best,
Joe