iTap RDP and group policy

A user recently complained that their iPad device wasn't able to RDP into their workstation. They were using iTap RDP (http://itap.mobi/itap-rdp) which seemed to work fine for old XP boxes and non-domain joined workstations. It would give a NLA error when it tried to connect even though this newest version does support NLA. I knew it had to be group policy related since it only affected domain joined PCs. I wound up having to unconfigure the policy "Always prompt for password upon connection" under Computer Configuration -> Policies -> Admin templates -> Windows Components -> Remote Desktop Services -> Remote Desktop Session Host -> Security. Then gpupdate on my domain controllers, then gpupdate on the host pc and rebooted it for good measure. Afterwards, then the iTap RDP client was able to work properly.