The vaadin version is not updated in the vaadin control panel after we upgraded the vaadin library manually in Liferay.
I upgraded vaadin.jar to 6.6.0 and recompiled the widgeset. I upgrated manually to copy vaadin.jar (6.6.0) in my liferay and project (portlet) librairies. Everything is ok with the upgrade except the vaadin control-panel that still showing a 6.5.7 version that is coming from its own lib. Its a little bit confusing. May it will be nice to indicate the version in liferay and the version for the control panel.