Hi Folks, By default cctbx dispatchers on macOS clobber DYLD_FALLBACK_LIBRARY_PATH with some stuff which means that from napari import viewer fails with a huge stack trace ending in OSError: dlopen(libobjc.dylib, 6): image not found If I comment out the clobbering in the dispatcher then everything works fine so I am fairly sure this is the problem Some questions - - why do we do this? - is there a way I can make a dispatcher not to this? or maybe leave the system DYLD… as it was and _append_ to rather than prepend? Seems like a thing I am surprised I have not broken a toe on before now Thanks Graeme -- This e-mail and any attachments may contain confidential, copyright and or privileged material, and are for the use of the intended addressee only. If you are not the intended addressee or an authorised recipient of the addressee please notify us of receipt by returning the e-mail and do not use, copy, retain, distribute or disclose the information in or attached to the e-mail. Any opinions expressed within this e-mail are those of the individual and not necessarily of Diamond Light Source Ltd. Diamond Light Source Ltd. cannot guarantee that this e-mail or any attachments are free from viruses and we cannot accept liability for any damage which you may sustain as a result of software viruses which may be transmitted in or with the message. Diamond Light Source Limited (company no. 4375679). Registered in England and Wales with its registered office at Diamond House, Harwell Science and Innovation Campus, Didcot, Oxfordshire, OX11 0DE, United Kingdom