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ISSUE SUMMARY: When I click on the "Sign In" main menu item, or the "Register" menu item in the footer under "Account", the page creates a redirect loop.
STEPS TO REPLICATE:
1. Click on any of the sign in, or register menu links.
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RESULT: Redirect loop.
EXPECTED RESULT: Should take you to the page.
BROWSER: Chrome.
I just test it with template protostar and everything is fine, I think this issue caused by your Joomla template, seems the Joomla templates bit missed there, I suggest you contact the template developer.
Because you click the "sign in" after you logged, if you click as guest it will work fine. But anyway, I already change the access thet menu for guest only, we the logged members wont see that menu.