as jj requests, te syntax for referring to ports in the ipb language has changed. BEFORE: a.1 -> b.2 # hook a's output #1 to b's input #2 NOW: a[1] -> [2]b # same Reason: now you can say a[1] -> [2]b[2] -> c[3] -> d # same as a[1] -> [2]b b[2] -> c c[3] -> d This equivalent syntax might be to your preference a [1]->[2] b [2]->[] c [3]->[] d love, ed