The problem I was having with the redirect loop on the new PayPal interface was solved by removing my security key (my smartphone.) This is obviously a poor solution, but until PayPal fixes the bug it's all I have. PayPal's tech support is completely clueless. They had me clearing caches on all browsers, switching from Chrome to IE (of all things) to Firefox, and pretty much running in circles. Remove the security key and voila!, it works like a charm.
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