I've been having the same problem. I'm forced to log in twice almost every time, and sometimes I get an error, "you're using an outdated version of Paypal" and something about how it happens with browser bookmarks. Clearing the cache does not solve the problem. I was worried it was malware but am glad that others are experiencing the same problem. I have Payflo Pro but I log into my main Paypal account most regularly (as opposed to manager.paypal.com).
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