Using Chromium nightly (build 35301) I can't update my profile settings. Clicking on "Save changes" gives no feedback and does not appear to save the changes. Other buttons in the app appear to work.
Interesting, does this problem happen for you when using other browsers or just chrome? I'd love to help you out (or fix the issue for others!), however can't promise anything if the issue is only on chrome nightly. Send us an email to ridewithgps@gmail.com or use the 'Feedback' button at the top of the site.