I just tested NetSurf on Ubuntu 12.04. I used the "netsurf" package found in system repository. http://packages.ubuntu.com/netsurf It's 2.8 and GMail works. University of Illinois portal gives a undesired error message; it should show a login.
Then I tried 2.8 on my Mac OS X 10.7.5, but nothing changed. So I wonder there is some problem in the Mac OS X port.