Thank you for the quick fix. I will give this a test in about eight hours as I have to wait for server activity to go down.
I assume you are able to reproduce this as I am dealing with a very complex set of rewrite rules and sometimes its hard to be sure they are all working at once without conflicting with each other and that it's not my own fault for a bad rule.
It helps though that I am able to stop lsws and start httpd within a few seconds of each other to test compatibility however.
On that note, keep in mind that apache DOES return the "missing" message on ErrorDocument with the same httpd.conf/htaccess however I will also give it a try with a raw browser tool I have like lynx - will post in a few minutes.