Ok, From that I take it your on a Mac platform . I'm not sure if this affects mac or just windows however it was recently fixed in 1.8
The trick is to move tiki from http://localhost into http://localhost/tiki
I think marcuis corrected the problem, but off the top of my head I cannot remember what changed.
If you can try that for me, and let me know, I'll get the fix backported into 1.7.5.
> > Damian:
> > The username and password fields are case sensative.