Thanks for the many answers. Once again, I learned about features I
hadn't used before, such as the source view and other useful things.
I exported my document to LaTeX and looked at it in a TeX editor and
got exactly the same error messages. Then I took my minimal example
from the first mail and it wouldn't compile either. TeX seemed to
complain about every single letter (always some kind of encoding
problems). Then I made a completely new minimal example with not more
than seven lines in the TeX editor and again got the error messages.
Funny enough, I got error messages for unreadable letters or signs in
lines one to seven, but also in line eight, nine, ten up to twenty-
something (where I gave up hitting enter). Well, I hadn't even
deleted a space there...
So I figured it could be due to my TeX distribution and re-installed
it and now everything works fine again. I wouldn't call this a
›solution‹ and still don't know why it got broken from one day to
another, but at least I can work with it again.
Thanks again for helping and stormy greetings from Vienna,
Max
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