Excel comments not displaying

The update that rolled out today 18-Jan-2018 has broken the rollover functionality.  The behavior I see is similar to what is described, but also includes a loss of speed of any data entry response over time.

When a spreadsheet with comment is first opened you can rollover a cell with comment and see the comments.  If you leave the spreadsheet open eventually this stops working, and at that point I seem to notice a delayed responsiveness to the app.  

The failure to show a comment is not instantaneous.  I timed this and after roughly 20 min the "display comments on rollover" stops working.  Perhaps there is a memory leak that is filling up virtual memory, but I'll leave that to the coders.

The only fix is to Quit Excel and re-boot.  I tried closing the file in question without Quitting Excel but that doesn't work.  You have to Quit the app. 

Excel Team -- Please repair this and return Excel to normal functionality as soon as possible.

I have similar problem. Some comments on the same file are visible and some others I see only the arrow and unable to edit.

I have a similar problem. Was working on a spreadsheet and mid-session the comment feature changed. When I hover over a cell, instead of seeing the comment box I see an arrow and a line. No box. When I select to edit the comment, the long line extends up to the top of the document and the box is compressed. Once I edit the comment and return to the cell, the comment feature behaves normally, but only for that cell. If I add new data & comment, everything works fine. But for all of the data that was in my document prior to the "change", I find I have to edit all the comments one by one to fix it.

I closed everything down and restarted excel.  It's working now....  

That was the trick is guess...

Not sure what caused it,but it's gone.   

Thanks for the help!

Can you please provide a snapshot?