403 Error: Unable to Save Result Data
I have H5P installed on a WordPress site. I have been using it to design a branching scenario for use in a LearnDash course. It was working fine until a month or so ago. Now, I cannot access any H5P content without receiving a 403 error: Unable to Save Result Data. This happens when I try and access any H5P content files. Once I clear it, it appears again when I progress to the next slide.
I have tried this on Mac Safari, Mac Firefox, iPhone iOS and MS Edge, all with the same result. I have Uncanny Reporting installed and thought it might be interference from that, but I contacted them and they said it is not. From reading other threads in this forum I found the .htaccess file in uploads and deleted it but this had no effect. I have also tried deleting and completely reinstalling H5P.
Wordpress Version: 5.4.2
H5P Version: 1.15.0
I realise removing the other plugins would be one strategy to find the issue, however this is problematic as many of them are supporting an existing course in the LMS. Any suggestions would be greatly appreciated!