Backup Status Overlays not showing

I just installed via Comcast subscription Norton Security Suite on my Windows XP machine.

I configured a Backup and my backup (to external USB drive) was successful.

I verified files are there via the Restore Files option.

According to Backup Details, 'Backup Status Overlays' is On.

But in Windows Explorer I do not see any visual indicator (no green checkmarks) on files which were backed up.

Seems this would be a handy feature - but doesn't seem to be working.

Ideas?

I just installed via Comcast subscription Norton Security Suite on my Windows XP machine.

I configured a Backup and my backup (to external USB drive) was successful.

I verified files are there via the Restore Files option.

According to Backup Details, 'Backup Status Overlays' is On.

But in Windows Explorer I do not see any visual indicator (no green checkmarks) on files which were backed up.

Seems this would be a handy feature - but doesn't seem to be working.

Ideas?