Thank you, Stefano.
I’ve version 6.6.8 installed now.
It looks like ‘Email not found’ issue is fixed, although I had to clear cookies to see it working.
And this is another bizarre issue:
1. Click on View Online link yourdomain.com/?nltr=[.] in email. This will be redirected to yourdomain.com/?na=v&nk=[.]&id=[.]
2. Now try to view any other newsletter from WP Admin or just by changing id in the URL. The output I am getting is always the same – the newsletter opened from the email (!?)
Could you pls have a look?
Thanks,
Elena