since two or three days I see a strange “problem”. The sorter of DT vanishes. It is not shown besides the corresponding menu-item says: “hide sorter” (“Sorter Ausblenden” - I use the German version). If I choose to hide (the not present) sorter and turn it on again, it is shown for about a second and then hides automatically. Can anyone give me a hint what to do to show the sorter again (and stay visible).