iPhone & iPad apps stuck on Loading when using RD Gateway

When attempting to connect to any machine - Windows 7, Windows 2008, Windows 2008 R2 - using a RD Gateway, on either the iPad or iPhone clients, a Loading indicator is shown and I can't get past this point.

I have attempted with and without NLS, with and without the Always accept certificate, plus different combinations of both, but I can't seem to connect through the RD Gateway. I attempted to connect to the machine directly while on the corporate LAN and had no issues at all.

The RD Gateway works as I have used it with the default Windows RDP Client, a Mac RDP Client and a competitor iPhone and iPad client. None of them had any issues. It seems that PocketCloud Pro is the only application that can't seem to connect using the Gateway.

Before you ask, I can't provide a test account based on the security policies of our company, but going through the forum I have found a few listings relating to the issue, but no definitive answers and was just wondering if maybe those that provided access to test accounts received private messages with answers due to security or other confidentiality reasons regarding their setup and was hoping that maybe they can share their experiences in solving the issue.

Thanks.