[NTG-context] utf8 editor problems

hello, I have a problem which is not directly related to context. When I create document in utf-8 I sometimes get "ïz£" (I hope this is displayed correctly in the mail clients, (a screen snapshot is attached also)) printed on a single page (in the pdf). These letters are not displayed in my standard text editors (scite and notepad++). Only when I open the file in amaya (a xhtml editor) I see these the following letters "" and I can delete them. Does anybody know something about this? Thanks Wolfgang