Usability: It is possible to create a contact with no name and thus have no good way to get to the contact page to fix this. The error message for not saving a contact's info shows up in an unexpected place. It was a bit jarring to be taken to the settings page after signing up--perhaps for the new user it may be more useful to guide them into setting up contacts? The ""Add Contacts"" link has a text cursor when I hover over it. It's difficult to read the black text on blue background when I hover over the links on the top bar.
Completeness: I'm getting an error when I try to save changes to a contact's name.
Overall: I like how you further simplified things between GR4 and GR5 and concentrated on making your core functionality more usable!
Thanks for all your hard work this term!