geoext/geoext — pull request #33 by adube (2012-03-16 15:47:33+00:00)
Title: Vector layer issues with PrintMapPanel

This is basically a patch made by Andreas sent on the users mailing list on January 14th 2012, but with some minor modifications.

The issue is originally caused by :
http://trac.osgeo.org/openlayers/ticket/2749

So, a way to work around this is to avoid cloning OpenLayers.Layer.Vector object. Instead, creating a new instance and pushing cloned features does the trick.