I have the latest Defraggler v2.02.253 and a PC with 5 drive letters (2 IDE hard drives) C, D, E, F and N.
E drive and N have no fragmented files, however after clicking on other drive letters and then back to E or N I see false red blocks drawn in the drive map.
If I click on "File list" tab and then back To "Drive" the red blocks disappear, however if I click "File list" tab they re-appear.
Also if I click on "Search" or "Drive map" they too do not display red blocks only when I click back to "File list".
I have no exclusion rules setup so this definitely looks like some kind of bug.
Richard S.