Hi,

site.ini.append.php

[RegionalSettings]
SystemLocale=de_AT.utf8

If you have that setting, the admin interface isn't working, because the css style output is wrong.

This line from pagelayout.tpl:
div#maincontent

will be written as
div#maincontent

',' instead of '.'

So, that css is not working.

Best wishes,
Georg.