I downgraded everything to stable.

version

now all good.

(add-to-list 'package-archives '("melpa" . "") t)

stable melpa repo and stable cider-nrepl version

If you're interested in handling dependencies in a way that allows you to prefer melpa-stable over melpa, I wrote a tool specifically for it: https://github.com/pyr/emenv and exemple Emenv file which pulls-in cider from melpa-stable: https://github.com/pyr/dot.emacs/blob/master/Emenv

anyone have issues with getting cider debug working?

If you don’t want to add an extra library, putting

(setq package-pinned-packages
      '((cider . "melpa-stable")))

next to print-length is there a way to control the amount of lines printed in a text?

for example: (print (apply str (repeat 100 "hoi\n")))) only prints 3 lines instead of 100?