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PayPal IPN Handshake Invalid Errors since 5.3.10


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We made the mistake of upgrading to 5.3.10 to make WHMCS support happy on another unrelated bug. Since then, it's opened up about 20 more bugs, however this one is a bit critical.


We're seeing tons of IPN Handshake Invalid errors since upgrading. They told me to manually force the charset in our PayPal profile, which is set. The invalid IPN headers even show the charset we forced so we know that's not the issue.


Has anyone else ran into this?

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