I can confirm this happens in master as well.
Note the PDF problem is a separate (but related) issue - the iframe that holds the PDF still uses the mahara installation as the source URL, and iframes from external sources seem to be disabled in modern browsers if you've opened the HTML file locally (ie. you're using a file:// URL)
I can confirm this happens in master as well.
Note the PDF problem is a separate (but related) issue - the iframe that holds the PDF still uses the mahara installation as the source URL, and iframes from external sources seem to be disabled in modern browsers if you've opened the HTML file locally (ie. you're using a file:// URL)