I had same or similar problem with windows 10 and cq server. Uptill few weeks ago i use conquest and kpacs storing us and xray pictures on my NAS - without any problem since few years !
Thank you Marcel. Great work and support.
I have 15000 series , its about 150 k jpg's . Not very much but enough for my small office. I changed my workstation from win8.1 to windows 10 . Nothing more works as intended. I considered changing to other Pacs system but nobody in my office wanted other software. In cq log i saw problem with finding files and writing on MAG0 ( which is NAS in my case )
After changing logon for services ( as upon stated) it works again ! Great!