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First of all thanks a lot for you fast answer. I believe as you that the problem occurred with the change to babel which I cannot undo. The babel package doesn#t work either. Then it has problems with the title page and its vowel mutations (that was the reason I inserted ngerman ). As you advised I ...

Hello all together,

in my thesis paper I inserted the following packages in order to change at German language which worked great (WinEdt7):
\usepackage{ngerman}
\usepackage[utf8]{inputenc}
Now I changed the packages because I had troubles with quotation marks. They are as followed:
\usepackage ...