The other incident happens replicably after the start of eclipse with a still opened file supported by the virtual editor. I have to close and reopen the file for a successful start of the editor. If more than one tab is opened all facelets views are broken.
I totally forgot to mention something: I am using Eclipse Helios and therefore the JBoss Tools 3.2.0.Beta2
http://community.jboss.org/servlet/JiveServlet/downloadImage/105-5238-11163/450-105/visual_editor_exception.PNG
