A little more info:
I cleared all cookies and cached content from my browser and closed the browser.
I then launched the browser and tried /new-file-storage directly (no login to openacs.org first). I was directed to the register/login page at sdm.openacs.org. When I entered my credentials, I was allowed access to /new-file-storage.
I then went back to openacs.org and was directed to the register/login page. When I entered my credentials, I was allowed access to openacs.org.
However, now when I try to access /new-file-storage, I'm directed to the (endless loop) register/login page at sdm.openacs.org.