The current Linux agent parser does not allow for special characters when reading the output.

For example, "df: ‘/tmp/tmp2’: No such file or directory" will cause the parser to crash with an "unprintable characters" error in /var/opt/microsoft/scx/log/scx.log. Note the "special" single quotes; this is what causes the error.

Because the parser stops, the SCOM server never gets anything back from the agent. Removing the special characters resolves the issue.