Have you tried upgrading to SPServices version 2014.01? 2013.01 gave me a ton of issues and forced me to drop back to v0.7.2. Upgrading today to 2014.01 worked like a charm.
http://spservices.codeplex.com/releases/view/116626
Also - have you tried putting your fully qualified URL into the webURL field instead of just the relative URL?