Hi,
I just tested it and Defraggler has still this annoying issue: 'Defrag Free Space' causes fragmentation - and I do not mean the second option that says "allow fragmentation". I defragmented all fragmented files on a drive (on the second tab, "File List"). Then I run an analysis and the drive was shown fragmentation free. Then I run 'Defrag free space' and the analysis thereafter shows 418 fragments on 135 files. I guarantee that the drive was idle otherwise, i.e. the only app that uses this drive was turned off.
I noticed this bug since ever (read: about since 2008) which is the main reason I haven't bought the product yet. Please, please, PLEASE look into that now.
Before you ask, VSS is disabled for this drive. This just should not happen.
System: Latest Win10 64bit.