Hi there,
I think I'm experiencing the very same problem (redirect loop) with a shared hosting account (Register.it Hosting Linux Professional if someone's interested).
I've assured myself that no file is missing after upload (I had been working in a local virtual machine and everything was OK) Pawtucket was successfully uploaded and accesses the database without problems.
When I try to access Providence, nothing is shown (not even the login form). I've modified php.ini (just to be sure) adding cgi.fix_pathinfo=0 to no avail. What else can I try?
Thanks.