und3rtak3r

I'll repeat my second comment: ​have now tested on other machines.. and this has fixed the issue for me.. For those that suspected Fubared configs.. many of the installations are CLEAN.. ie new installs on new pc's

That is good for you.. So OK.. What has changed.. ? Have just tested on WIn 8.1 - My default is to have "Move large Files to End of Drive during whole drive defrag" enabled Disabling that setting and all appears well. So that appears a reason 2 of my machines..

Have a number of clients with this issue: All complaints has come from the Defraggler Free users, none thus far from the paid.. Checked in my office, ver 2.17, 6% fragmentation, do partial defrag wait for 30% and still 6% fragmentation, update to 2.19... 10second defrag.. complete with 6% still fragmented.. Cant convince any of the free users to convert to the paid.. lost faith in product.. Even Quick Defrag is useless. 2 seconds and "done".. nothing done Reverting all free users to 2.18 or earlier.. 2.19 update is a waste of time.. as bad as Microsoft's Vista defragmenter.