I am encountering the same problem as reported by others here. Jetpack 5.2 has introduced a bug for usage of TinyMCE outside of “post” screens.
I got it. In /includes/getid3/getid3.lib.php on line 285, change break; to return;. Enjoy!
I have to dig it out. I’ll get it for you. 🙂
Unfortunately there’s been no response from the plugin author. I’m rather surprised at the lack of testing for the new PHP7, and no concern for an identified fatal error.
I simply corrected the code myself. Now, if there is an upgrade to the plugin and this issue isn’t addressed, the code will revert back to being broken, so the issue is still important for the author to acknowledge.