Hi Matt,
I Logged a ticket yesterday and was told its an issue since google made some changes to their API.
This morning i fixed the issue and replied to the support ticked informing Steve.
Regards
Jack
Tried this plugin to add the API Key but betting a different error instead,
https://wordpress.org/plugins/api-key-for-google-maps/
admin-maps-mashup-metabox.min.js?ver
=4.5.3:1 Uncaught TypeError: Cannot read property 'Autocomplete' of undefined