Problem solved! A unix-friend made a suggestion that proved to be correct: the authorized_keys file has to be non-writable. I had just copied in the key so it got some default protections. chmod 710 did the trick. Sorry to bother you guys...

In reply to Re^3: Net::SSH2 error - Username/PublicKey combination invalid by BernieC
in thread Net::SSH2 error - Username/PublicKey combination invalid by BernieC

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