Updating the system installation with the newest Org version produced this (old) error. This time I've got something sensible as backtrace:
Test test-ob-sh/session backtrace: (cl-block-wrapper (catch (quote --cl-block-nil--) (let* ((i 6) (fram (block nil (let* ((i 6) (frame nil) (--cl-var-- nil)) (while (progn (loop for i from 6 for frame = (backtrace-frame i) while frame colle ert--record-backtrace() (let* ((condition (first more-debugger-args)) (type (case (car condi (cond ((member* first-debugger-arg (quote (lambda debug t exit nil)) (case first-debugger-arg ((lambda debug t exit nil) (apply (ert--tes (ecase first-debugger-arg ((lambda debug t exit nil) (apply (ert--te (let* ((more-debugger-args debugger-args) (first-debugger-arg (if mo (progn (let* ((more-debugger-args debugger-args) (first-debugger-arg (destructuring-bind (first-debugger-arg &rest more-debugger-args) de ert--run-test-debugger([cl-struct-ert--test-execution-info [cl-struc (lambda (G7961 &rest debugger-args) (ert--run-test-debugger (symbol- apply((lambda (G7961 &rest debugger-args) (ert--run-test-debugger (s (lambda (&rest --cl-rest--) (apply (lambda (G7961 &rest debugger-arg ansi-color-apply-on-region(#<marker in no buffer> #<marker at 16 in ansi-color-process-output("") run-hook-with-args(ansi-color-process-output "") […] Test test-ob-sh/session condition: (error "Marker does not point anywhere") FAILED 113/214 test-ob-sh/session Regards, Achim. -- +<[Q+ Matrix-12 WAVE#46+305 Neuron microQkb Andromeda XTk Blofeld]>+ Factory and User Sound Singles for Waldorf Blofeld: http://Synth.Stromeko.net/Downloads.html#WaldorfSounds