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As you may know, Pax Runner caches the jars it uses, so you may run into cases where the latest version of the framework is not really the latest. To avoid that, use the option --overwriteSystemBundles. This option guarantees that the system bundles (=framework itself) wil be re-downloaded.
This feature is being tracked by http://issues.ops4j.org/browse/PAXRUNNER-203