I just installed 1.17
The system is a dual xeon 2.2 with 2gb ram, 2 pairs of sata raid 1 and the swap on another sata channel.
The first hand was as follows, analyzed drive c, then clicked on the "swap" drive. Defraggler froze and showed "not responding" in the task manager.
Second, restart the machine, analyzed drive c, did something in another window, tried to return to defraggler but it was "not responding".