@karimicus first and a little late: Welcome to the Rockstor community. Just wanted to link back to a post I just made in another similar threat where I’m pretty sure I replicated your original findings linked forum post. Also used plex and 1001 and latest.
Thanks for helping to look into this one, I’m afraid I can’t contribute much else just for a bit but it looks like the problem is narrowing down a tad and is already in hand by the looks of it. @bug11 thanks for your efforts on this one; upon a resolution I’ll update my doc pull request against the plex howto.