I did my document in an ISO-standard. It does not support umlaut alphabets, such as ä and ö. I need them. The document gets compiled without UTF8, but not with UTF8. More precisely, the document does not get compiled with the line at the beginning of my main.tex:
\usepackage[utf8]{inputenc}
How can I compile my LaTeX document in UTF8?
I'm not sure whether I got your problem but maybe it helps if you store the source using a UTF-8 encoding.
I'm also using \usepackage[utf8]{inputenc}
in my LaTeX sources and by storing the files as UTF-8 files everything works just peachy.