Google Play Billing extension - GPBilling_Purchase_VerifySignature() - anyone else getting issues?

Hi,

For anyone using the GPB extension, did you ever have any issue with the "if GPBilling_Purchase_VerifySignature()" check not passing and running subsequent code? I'm currently experiencing this and have created a ticket at the extension's github page., but wondering if someone else here might have encountered it, and if so, what they did to correct it.

Thanks.