XYplorer Beta Club

No clue how it got there, but I've got one directory in the tree that now has a permanent grey background. It remains when I close XY, it's in the mini-tree. It doesn't seem to do any harm, but it's just annoying.

Any clues?

XY: 27.20.1200 (32-bit) / W7-64 Pro

And on 27.20.1400 it still is there, just updated.

A highlight color was set to it?

Here's a screenprint with the directory marked. I am totally clueless, F9 "indicates" that the colour might indicate a "boxed branch", but what the flippin' 'ell would that be, and how can I have set it accidentally????

Right click on that folder > Mark item in menu > check if maybe it has Highlight or Box Color set.