Just deleting cookies did not work for me either until I went to "Delete cookies from a specific site". I use Edge:
- Select Settings and more - click on Setting gear - Cookies and site permissions
- Under Cookies and data stores select Manage and dlelet cookies and site data - see all cookies and site data an search for MSN.
- delete the MSN cookies
Once I did this the comments were back. Had to do it a couple of times after starting up my computer a few days but after that seemed to work. If they disappear, I just do these steps again.