[Defraggler freezes when selecting a drive from the list while running a defrag]

I confirm that after clicking Defrag on the D: disk the button is grayed out.

 

I cannot see whether the Defrag button button is grayed out or not for the other drives, as when I select any other drive from the list the program freezes before the GUI is redrawn.

[Defraggler freezes when selecting a drive from the list while running a defrag]

10.0.15063, v2.21.993

[Defraggler freezes when selecting a drive from the list while running a defrag]

Hello,

As already outlined in the title, Defraggler permanently freezes when I select a drive from the list while defragging a different drive.
I did this while trying to defrag two drives at the same time (I'm not sure this is possible - I was just experimenting).

 

I can consistently reproduce the bug with the following steps:

• Open Defraggler
• Click on D: drive
• Click on "Defrag"
• Click on V: drive

After doing this Defraggler freezes and never comes back. Task Manager still shows 100% D: drive utilization, so I'm guessing the defragmentation still continues in the background even when the GUI is frozen.

 

My Speccy: http://speccy.piriform.com/results/qsZqu2nT2TjHTNYFpOnspV1