DO9 "Select Destination Folder" when double-clicking a file

How do I turn off the behavior of a "Select Destination Folder" window opening when I double-click a file name in DO9?

This is something I just noticed today. I may have accidentally changed a Preference setting, but I'm not sure which one.

When I double-click a file name (for example a video or mp3 or pdf), the appropriate default program will launch, so I can watch a video, listen to an audio file, or read a pdf, but also DO9 also launches a "Select Destination Folder" window.

I want to turn off this behavior. (I also don't quite understand what "select destination folder" would be used for in the context of watching/listening to a media file or reading an ebook, since I'm opening a file but not moving/saving/copying it).

Thanks.

You may have done something under Settings -> File Types to the events of one of the items in there. Do you remember doing anything like that?

Thanks, Leo. I'm not sure what I may done in the Settings, but after a reboot, the double-click is behaving normally and that extra window isn't opening any longer.