"unabletocopy" when creating H5P content in WP
So we had a source WP blog with H5p plugin installed. Works fine.
We then cloned the blog (https://premium.wpmudev.org/project/cloner/) and now when we save any H5P content it comes up with the message "unabletocopy" and does not display the content.
The content appears in the list of H5P content and it can be edited and the object is saved, but still does not appear in the preview, or with the shortcode - same ""unabletocopy" appears when saving.
Have tried updating the content library and also deactivateing / reactivating the plugin.