this one has been around for ages, it was only recently that I figured out what causes it, so I can finally report it
You drag&drop some files, then notice you forgot one and abort the drag&drop (for example by dropping it in the list view, so it does nothing). If you Ctrl-Click on the file you forgot, nothing happens. You need to do that again for it to have the desired effect. The first Ctrl-Click seems to go nowhere after a drag&drop operation (I think it's the same thing if you complete the drag&drop successfully, but that usualy means you don't have to correct the selection so it's not as much of a problem).
For some reason this happens multiple times a day to me, I guess I'm having a hard time concentrating on what files I actually want
bye
Creat
XYplorer Beta Club