David,
thanks and also thanks for others helping. I was successfull to load Freetype fonts and change them on the GUI. It seems that if a glyph is missing from a font, squeak types a blank character space (no glyph printed). But when typing o" and u" characters nothing happens, so it could be another problem, not only a font-glyph question.
I'm not interested in digging deeper into the system, as I'd like to concentrate on applications porting but not system hacking.
I may continue my tests with ST/X and VisualWorks, but I'll follow this mailing list and also the Squeak homepage as it seemed to be the best choice until now with a very active community.
Thanks again for all your help!
Best regards
Robert
Image is the issue here I think. 3.9 VM is supported by FreeType. My images are 3.9 and 3.10.