I encountered strange bug coming from Microsoft Word file when copying and pasting the texts. The Rich Text Editor isn’t able to save it because of Word’s very specific tag:
<o:p></o:p>
I compared that to tiny.cloud using both of their options: “Remove Formatting” and “Keep Formatting” and neither have that weird ‘<o:p></o:p>’ in their source code.
Here are the file and the short clip for your reference in ZIP format. Thanks.
Tested in CM1 instance with latest patch. If the instance is updated with latest patch the TinyMCE version should be Version 4.5.8 (2017-10-05). You can find this information in the server under Percussion\sys_resources\tinymce\changelog.txt file.
I’m on the same version as you are. That’s weird. I used Chrome to paste it in there. I wondered if it’s normal on PC side but not on Mac side for copy/paste-wise?