OK, I've worked it out. This pic shows what I mean. The red rectangle shows the data displayed when I click and hold on a note. The mouse cursor doesn't appear in the screen capture for some reason.
It seems that it's down to whether or not Cakewalk is running as administrator.
I use Sound Forge as an audio editing tool from within Cakewalk. It appears under the Utilities menu in the main window. Unfortunately SoundForge will only launch if Cakewalk is running as administrator, so I've set my desktop shortcut for Cakewalk to run as administrator. When I run Cakewalk from the desktop shortcut I don't get the data display. If I run Cakewalk by double clicking on a .cwp file, Cakewalk doesn't run as administrator and I do get the data display.
Another thing Cakewalk won't do when running as administrator is allow you to drag and drop files from a windows folder onto Track View.
So, problem solved.