I have installed my Magento development server with a copy of the production server, everything works apart from all admin pages that rely on the grid, which never load.
Upon attempting to load any grid (be that CMS listings, Customers, Products, Search Terms, etc.), I first receive an Attention - Something went wrong message, quickly followed by a second Attention - Something went wrong message. Clicking OK on both of these clears them away, but then the loading icon just spins forever.
Additionally, the grid data is not populated at any point.
I have tried disabling Stores > Configuration > Advanced > Developer > Grid Settings > Asynchronous indexing, on the off-chance it would help, but it has had no effect.
Watching both var/log/system.log and var/log/debug.log only shows the following upon page load, but I don’t think it’s related to my problem after researching this log entry (I could be wrong however):
main.INFO: Broken reference: the 'notification.messages' tries to reorder itself towards 'user', but their parents are different: 'header.inner.right' and 'header' respectively.
Watching my /var/log/apache2/error.log shows nothing upon page reload either, so I’m at a loss how to fix this issue.
Any help, advice and/or tips would be greatly appreciated. Thanks in advance.