frankit

In the plug-in page I still see “Compatible up to: 4.5.3”, that might be mostly true, but there’s a backend option completely broken (experienced and tested by few people), so I think it’s a bit unfair keep that compatibility information after reading this topic.
I voted for incompatibility between wp 4.5.3 and newsletter 4.5.4, and I suggest other people experiencing this issue with a clean wp install to do the same.
Of course we should thank the developer(s) to this free plugin release, and probably nobody expects instant fixes for free products, but would be very useful, at least for those that uses that option, to just KNOW if the developer(s) plans to give a check to this issue.

Thank you again.

I have the same problem after upgrading to 4.5.3.
Stefano, your suspect about “badly written plugin” sounds really strange to me because I actually downloaded a fresh and clean install of wp 4.5.3, then installed just the newsletter plugin and the “wp-registration” setting page fails requiring the unnamed-file.wp exactly as my production site with several plugin installed.
So actually seems that your plugin is not fully compatible with 4.5.3.
Do you plan to provide a fix or just drop the full compatibility with the latest version?

Thank you.