Hi! I followed your tutorial and it's just awesome! It's my first time with the RPi and your tutorial for sure made everything a lot easier.
I read all the comments and found a similar problem as mine.
Every new tv series episode and movie that it's created in my Downloads folder with 0755 permission, so the post-processing routines do not work and are sttoped with the message the file is locked. I tried deleting the torrent files from transmission but the message is the same.
But, when I run the command sudo chmod -R 775 /home/osmc/Downloads, permissions are corrected and post-processing runs just fine.
That's the result of ls -la for my Downloads folder:
drwxrwxr-x 3 osmc osmc 4096 Sep 22 22:46 .
drwxr-xr-x 9 osmc osmc 4096 Sep 18 23:48 ..
Any help would bu much appreciated.