Hey guys,
Unfortunately, this is due to an issue in the Instagram “Basic Display” API which has been reported by multiple developers over night. Here are links to some relevant bug reports (report one, report two). This isn’t due to an issue with WordPress or with our plugin, but is an issue with Instagram’s API itself and so is affecting all plugins and all apps that use their API.
As it’s such a critical issue, hopefully Instagram will resolve it very quickly, but they have not yet responded to the bug report and so I don’t have any update on it yet. You can click the “Same here” button on the bug report and subscribe to it as that may help escalate it’s priority.
In the meantime, this does not affect the “Business” API, and so you could convert your Personal Instagram profile into a Business profile by following these directions. It is free to do this and business accounts have some additional perks too. Once you’ve done this (or if your profile is already a business profile) then you can reconnect your account in our plugin by clicking the “Connect Instagram account” button, and then select the “Business” option.
We apologize for any inconvenience here. Hopefully Instagram can get this resolved very soon!
John