Not imported or missing from the release (access to path problem)

Sonarr version (exact version): 4.0.1.929
Mono version (if Sonarr is not running on Windows): ?
OS: MX Linux
Description of issue:
I don’t know if it’s a coincidence, but since I updated to v.4 I keep getting a message that " Downloaded - Waiting to Import
One or more episodes expected in this release were not imported or missing from the release" followed by the particular TV episode.
The episodes are downloaded and appear in the completed downloads directory. Sonarr indicates no health issues with my configuration.
There is also a recurring message that I see that “Couldn’t import episode /media/[my media location]/sabnzbd/complete/[name of TV episode]: Access to the path '/media/[my media location]/[name of TV episode] is denied”.

Any help would be appreciated.

Is v4 running as the correct user/group and the files/folders have the correct permissions for that user/group?