I've made a number of changes to sb-sprof lately, as a consequence of which the previous releases of sb-sprof-ui and slime-sprof will no longer work with the next release of SBCL. An updated version of slime-sprof is available. sb-sprof-ui is not going to be updated. On the plus side, sb-sprof should now be more reliable, have a lot less profiling overhead for long profiling runs, and directly supports the allocation profiling patch that I discussed on this blog earlier. It also has more documentation which I would link to, except that the SBCL manual auto-builder seems to be running a few days late.