You can't use an exp lamp on runecrafting even though it's been released. When you try to use an exp lamp on runecrafting it says it hasn't been released yet.
I think this might be because Ryan hasn't "Fully released" It yet.
I may be wrong and probably am, but whatever. :P
I'ts not really a bug it's a matter of Ryan not adding it yet. :-\
This is a bug and has been fixed for the next update. :)