Hi Evan,
Thanks for your prompt response.
Even with the debug defined, it is still only throwing the null error without any detailed information.
Tested by removing the API key, saving, disabling the plugin and inputting the API key again with no luck.
I've also tried toggling the debug information which also shows the null error within the logs with no additional info.
I contacted Mailchimp to ensure the IP address of our shared hosting with godaddy wasn't blocked in which they confirmed there were no issues from there side.
I'm assuming right now that godaddy shared hosting has for some reason decided to block the MC API, but it's hard to confirm without a detailed error.
Thoughts ?
Thanks,
Nathan