Some uploaded files (example.org/wp-content/uploads/gravity_forms/2/2011/11/file.pdf) can't be viewed, showing 403 Forbidden.
Apache log says Permission denied: file permissions deny server access and FTP shows these files as rw-------.
But most files in /gravity_forms/ are rw-r--r--, which allows them to be viewed. The rw------- files seem to be distributed randomly.
Any idea why GF is saving some with the wrong permissions, and how I could fix it?