I'm having the same problem.
Using wifi with a google apps account. I can successfully login to the Windows companion with my google account but the app crashes on the ipad as soon as I enter in my credentials. I'm using the most recent version of iOS.
edit: i want to use rdp not vnc.
Same thing is happening to me. I just installed the PocketCloud App, not sure on the version, but it's whatever version that would have been available yesterday (the Free one). As soon as I enter my gmail credentials the app crashes and closes. I'm using a 32GB iPad, WiFi only on a corporate Cisco WiFi public network. The crash is immediate, instantaneously upon entering the "Next" button. I just rebooted my iPad (based on the prior post), but it didn't fix the problem. I've also uninstalled and reinstalled the app.