Back again with another possibly obvious problem. But it's Friday so let's get to it!
Everything with NetAudit and the messaging system seems to be setup correctly. I've verified access in the RANCID configuration. The router (188.8.131.52, for example) appears in WebSVN although when I access it, not a single line appears in the file. Odd, huh?
Looked through the troubleshooting documentation provided by Opsview and checked the "opt/opsview/repository/include/config.php" file for the possible enscript issue although that's already uncommented.
Will be checking through the messaging logs in the meantime although seems to always be helpful to post.
Thanks to those who put up with me :-]