Error when saving Canvas Design "Data loading is still in progress. Please save the view once it is complete"

Error when saving Canvas Design "Data loading is still in progress. Please save the view once it is complete"

Hi

I'm trying to save a canvas view but I keep getting the error message "Data loading is still in progress. Please save the view once it is complete".

I've waited, reloaded, rebooted, cleared cache and still get the same message.

Any help please?

Thanks
R