To get this working with 3.7 I had to edit the wow_form. I did this by going to my admincp. Then Styles & Templates -> Style Manager -> Next to my default style I expanded the drop down menu and selected Edit Templates - > Go - > I scrolled down to wow_form and double clicked. Searched for:
Code:
<input type="hidden" name="posthash" value="$posthash" />
added before:
Code:
<input type="hidden" name="securitytoken" value="$bbuserinfo[securitytoken]" />
I also had to turn off the human verification manager to get it to work. That is under vbulletin options in the admincp.