Hello, My Maxima is 5.9.0 with CLISP 2.31, Mandrake 9.0 I encounter: >diff(sin(x),x,1); => dsin(x) -- dx >ev(%,diff); gives the same result. >diff(sin(x),x,2); => will be evalueted as expexted >printf(share.usg) => BREAK[1]>(run) => maxima restarts, but > kill(all); => never returns! How can I solve these awkwardnesses? Konrad