symbols visualize problem

Hello: I have a simple plain text document that contains the following symbols: • − ⋆ ▷ ∘ ◯ ◯ □ In trinity applications (eg kwrite) they are not shown correctly. Instead of the symbols squares are shown. Libreoffice shows the symbols correctly. On another machine which has legacy KDE 3.5.10 the symbols are also shown correctly in kwrite. Whys is this and how can I fix it? I use trinity 14.0.4 in openSUSE 13.2 64 bit. Thanks, Istvan