Did I miss a message explaining the new start-sender interface? The code below worked before the latest changes to log5. Michael ************************* CL-USER> (require :log5) NIL CL-USER> (use-package :log5) T CL-USER> (start-sender my-test-sender (stream-sender :location *standard-output*) :category-spec (warn+) :output-spec (time message)) debugger invoked on a UNBOUND-VARIABLE in thread #<THREAD "initial thread" {A744959}>: The variable MY-TEST-SENDER is unbound. Type HELP for debugger help, or (SB-EXT:QUIT) to exit from SBCL. restarts (invokable by number or by possibly-abbreviated name): 0: [ABORT] Exit debugger, returning to top level. (SB-INT:SIMPLE-EVAL-IN-LEXENV MY-TEST-SENDER #<NULL-LEXENV>) 0] 0