Clojure tool support is pretty rough, even when your main editor is Emacs. Not infrequently I have issues with swank/slime whereby I cannot load libraries correctly, maintain a proper connection or correctly eval a buffer (possibly related to the first issue mentioned). I hope that after 1.2 the community will stop changing the language, fix their infrastructure and let a set of libraries stabilize. Right now, half of the really nifty libraries are on 1.2, the other half on 1.1.
