Include the new Root 2 Geo Trust Global CA in the authorize.net.crt file as replacing it will wipe out the other certs...for some reason the Root 2 Geo Trust Global CA isn't in either of the default files. I would just make the change in the authorize.net.crt file and leave the cacert.pem file alone. The if block reads from the authorize.net.crt file or the cacert.pem file.
Mines working as well...also make sure that your SSL is SSH2...and follow the Authorize.net instructions you should be good to go...Thx for letting me know! Tim
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