This problem occurs with M9 and Monochrom. If USB is set to PTP (no problem with Mass Storage), I can download all pictures via Lightroom 6 on a Mac Pro. Everything is fine except when the downloading is finished, and I disconnect the USB cable, the camera M9 and MM hangs completely. It can only be started if the battery is removed and then re-inserted. Was just wondering if anyone else has noticed this same problem?
Thank you in advance for any comment although my current solution is to use only USB Mass Storage.