Hello,
We are on 1 month trial before we moved from old system. We were editing settings and we added our own currency all was good till here. We are not able to remove/add/active new currency at the moment.
http://i60.tinypic.com/w709jc.png
http://i59.tinypic.com/2h7e92t.png
May be this currency is set as basic? Try to set another currency as basic