Michael,
the last 2 warnings (URL file-access,no suitable wrapper) disappear, if allow_url_fopen = On. The first 5 are the same.
I changed “force-download”, but the files are still corrupted.
I also tried Joomla 1.6.5. Same problem.
You can test the problem here:
http://j17.start.he-hosting.de/index.php/easyfolder
Click the disc-icon, download and open the jpg/gif.
I can mail Joomla and FTP Login data.
However on this server we can change only few PHP Variables due to provider restrictions.
Tom