JBoss Server View ID org.jboss.ide.eclipse.as.ui.views.JBossServerView has been changed to org.jboss.tools.as.wst.server.ui.ServersView. However, it hasn't been changed in the Seam perspective (org.jboss.tools.seam.ui) as well as in the perspectiveExtensions ext. point (org.jboss.ide.eclipse.as.ui) for the Resource Perspective.

This issue can be reproduced by resetting the Seam or/and Resource perspective.