I use font aweseome icons regurarly with pagelines and recently encountered several, that simply won't show up in the output page.
a few that simpy don't work for me are icon-anchor, icon-archive, icon-bug...all others around them or in between from the list (http://docs.pagelines.com/tutorials/font-awesome) work perfectly.
I use the following syntax
[i]icon-archive[/i] for all icons. Icons like icon-info-sign work, others simply won't be displayed at all.
Shortcode conflict should make all icons disappear I guess. I'm using the plugin Icon Font Shortcode (http://www.pagelinestheme.com/icon-font-shortcode/).
I thought this plugin used the same icons list provided in the pagelines docs, as it refrences it.