Just newly installed Mosaico - I did the three extensions in the right order and the correct versions (afaik), but when I try to create a mailing, the templates are not there, just the text/title. There's no way to edit the template, either when creating a new mail or via the Mosaico Templates menu link.
It's also gone super slow - is this related?
I was going to do a screenshot but now the Mailing edit page won't load. No error message, it just displays the Title ('CiviCRM') and a blank page. Is this related? When I disable just the Mosaico extension, the speed almost returns to normal and the normal 'traditional' mailing component works as normal.