WordPress 4.7.1 has a bit of bad code that means people uploading an MP3 file to their WordPress media folder are presented with a Security Issue warning.
This is a known issue that the chaps at WordPress will fix in the next release of the CMS; namely 4.7.2.
Update: Seems 4.7.2 didn’t fix this issue.
Meanwhile there is a plugin that will fix this for now.
It is called Disable Real MIME Check, download it here.
Now, if you happen to suffer from an RSS feed issue, and you are struggling to fix it, then this plugin may get you going; Fix My Feed RSS repair – here
The plugin is out of date for the current CMS, but it worked OK for me in 4.7.1
If you have any questions about using WordPress, or tips and tricks to share, use the Contact form at www.SteveHart.co.nz
Cheers for now.