Sound in filtering settings corrupted - [Mailmon 1.9.6]

Ok, I'm still not giving up! I have tried several more configurations, and it seems that only a certain combination of settings causes the problem... to make things easier

Could anyone please test this:
* Create a new filter with rule: 'subject' contains 'qwerty'
* Specify a custom sound
* Save it to folder
* Mark as spam
* Check "Mark as read (no notify)"
* Check "Delete from server"

Now it should look like the screenshot above.

Now send yourself a message with 'qwerty' in the subject and check for new mail in MailMonitor... and the sound setting should be lost...