Problem Statement:

1. End user creates a page.
2. They add a table to the page in Collaborative Editor.  
3. A 3x3 table is sufficient to demonstrate the issue.
4. Attempt to highlight a row with the background cell color
5. This fails in the instance as a row will not be highlighted

Steps to recreate:

1. Install a new instance of any of the affected versions listed of Confluence
2. Create a page
3. Add a 3x3 table as above
4. Attempt to highlight the middle row (not the header row) with a different background cell color
5. This will fail

Workarounds:

1. Highlight a single cell at a time (tedious, but works) OR:
2. Use the Confluence Source Editor and alter the tag for the table cell highlight from:

   class="confluenceTdhighlight-$color" 

   To the following:

   class="confluenceTdhighlight-$color highlight-$color

These two methods will work, but it appears that the editor is simply failing to complete the tag herein.