When I craft, the glowy graphic starts but the sound doesn't play, and when it finishes it says "Failed!" and "An unexpected error occurred on the server" and nothing is crafted.
Also whenever I craft (before, and now when I try), I can't type in chat until I alt tab out and back in.
It would be great if you could post some more details about your system. (See the sticky on this forum, if you're not sure what I mean.)