Has there been a recent change in the PHP configuration of apache2-argon.kearny.dreamhost.com?
I am getting call-by-reference errors on code I am sure I have not changed, and I wonder whether there has been a change in the server configurationn.
You should be able to tell by running phpinfo(). If you don't have a record of your "old" configuration, you might be able to find something to compare it to at php.dreamhosters.com. Make sure you let us know if you see a change.
I got this fixed much earlier, I had been running in cgi mode and inadvertently changed my .htaccess had been overwritten.