Hello 
Thanks for the report 
I’m working on a big update to be compatible with new Discourse changes. But I need more time to update everything…
The fontawesome issue is mostly coming from the fkb_panel_items setting. Which still use FA5 icons. Until then you can change it manually in that setting. Change: cog → gear, pencil-alt → pencil and if you added custom ones than you can check the FA6 icons on fontawesome website.