You can check the log files of both Ornatrix and Redshift for errors or warnings. Ornatrix log file is in the temp directory.
Which are your OS version, Maya version, Ornatrix version, Redshift version?
Does exactly the same combination of versions work on other machines?
Does just hair disappear from the image, or all rendering fails?
Ivan Kolev (Software Developer, EPHERE Inc.)
E-mail: ivan.kolev at ephere dot com
Discord: ikolev