Latest version of Defraggler (2.00.230) downloaded and installed (and yes, I have made a donation ). Works as expected, except when I did a freespace defrag after a full "C:" defrag, the program just closed down, with no messages or on-screen error reporting. Dr. Watson did capture a dump and log, attached here.
drwtsn32_log.txt - renamed from drwtsn32.log as I am told I can't upload files of type ".log"
user_dmp.txt - renamed from user.dmp as I am told I can't uplod files of type ".dmp"
I hope this helps.