I have found with Rzr recovery that when it hangs like that the install didn't go through.
What I mean is if you run a rom.zip take notice how long the installation takes. If it zips through it more than likely it didn't take.
This happens to me exactly at anytime with any rom.
All you do is just boot into recovery again, wipe all once and reinstall.
Just keep your eye on how long it takes to install.