Permission denied while running under docker

[MikeyMan83]

Don't really know if this is a DSM7, a docker or a Medusa question, so i'm searching my ass off ;)

Situation: Installed Medusa on my new DS1520+, had to use docker because i was forced to update to DSM7.
Now, most is running quite well after a very (VERY!) steep learning curve.

Created a Docker user (1040:100), and gave that user access to all folders i need. These were previously created in DSM6 (Or even 5?).
Now Medusa is able to download and move shows as before.

However; when i try to remove a show, it gives the following error:
SHOWQUEUE-REMOVE-SHOW :: 247897: Unable to delete /Series/Homeland. Error: Error: 13: Permission denied

No clue what other permissions i am lacking, since writing seems to go okay. Anyone got a clue?

[p0psicles]

There is a sonology DSM 7 Medusa package from @BenjV that's advised over docker.