Sean Pearce (6/19/2013)
http://sqlblog.com/blogs/tibor_karaszi/archive/2009/09/19/sql-server-agent-jobs-and-user-contexts.aspx
Thanks for this link, but it doesn't quite help me figure out why it's changing my login context to 'sa'. I'm sysadmin, so it shouldn't do that so far as I know.
Unless something is going hooey between the context translation of me and the job owner (both accounts are sysadmin).