When I customize the Nuxeo 5.5 using Nuxeo Studio, the default column for Live Edit Link doesn't show the icons link on the document listing page.
If i remove the customized plugin then the Live Edit Link is there again. So I think there is something missing for that column or some option is not properly configured.
In our case we are using the org.nuxeo.ecm.platform.liveedit.config parameter set to server