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My security codes aren't working (invalid). Using Google Authenticator.

Anyone else have this issue?

Yup, have the same issue, went with sms-version because of this ;(. Google Authenticator on HTC Desire HD with custom ROM

When I first used Authenticator I had this problem, because the clock on my phone was a couple of minutes out of sync.

There is room for some error but it is worth making sure the time on your phone is correct.