I use WP-dTree 3.5 and found a bug which only appears, when "Folders are links" is selected. please have a look at:
http://www.geodoktor.de and click "Referenzen" (page-ID 9) - then
Arbeitsgebiete->Umweltgeologie (page-ID 98) gets opened & selected.
this is a tree of Pages, sorting is: menu order
the bug does not show when I sort by ID