Ok, I'm now using 2.26.18 and I get similar-looking failures in umlisp and commonqt:
unhandled SB-FORMAT:FORMAT-ERROR in thread #<SB-THREAD:THREAD "main thread" RUNNING {1003179343}>: error in FORMAT: no more arguments
~A completed without~*~@[ its input file~:p~{ ~S~}~]~ ~@[ or~]~*~@[ its output file~:p~*~{ ~S~}~] ^
Dear Zach, oops, apparently, I'm no good at writing non-trivial FORMAT strings. It should be fixed now — but now it will issue a warning about something fishy in those builds: some output file is declared but never actually created, or something. —♯ƒ • François-René ÐVB Rideau •Reflection&Cybernethics• http://fare.tunes.org A common man marvels at uncommon things; a wise man marvels at the commonplace. — Confucius