The issues related to logging in to the European PC/Mac megaserver have been resolved at this time. If you continue to experience difficulties at login, please restart your client. Thank you for your patience!
Make sure you have the materials as well. I've accidentally forgotten to make sure I have enough more then once.
If you need to, uncheck the 'materials' and 'knowledge' at the top. It'll show you all the options available. If you have the knowledge and the materials and it's still not showing up, logging in and out usually fixes that for me.