[Ubuntu 15.04] Video conversion fails (Transcoder crashes or failed to start up) (video with subs)

Hey everyone

I updated my PMS to 1.1.4.2757 (can't remember version I used before - I think it was < 1.0) and also changed the location of the application file and tmp folder (There was not enough space left on my boot disk).

Since the update and those changes videos with subtitles won't play anymore. Error: Video conversion failed. The transcoder crashed or failed to start up.

Part of the logs:

Oct 20, 2016 13:59:06.447 [0x7f3d6cffa700] ERROR - [Transcoder] /media/raid/Plex_tmp/plex-transcode-ihycrkn15pme9d6dk7k138fr-ca7900ff-b0f2-4fde-b5ce-2023af03461f/temp-0.srt: Invalid data found when processing input
Oct 20, 2016 13:59:06.449 [0x7f3d757fd700] ERROR - Failed to start session successfully.
Oct 20, 2016 13:59:06.450 [0x7f3d757fd700] DEBUG - Streaming Resource: Terminating session 0x7f3d7214c120:6dy1025u373cqwadhr1mwsif6r which is using transcoder slot.  Used slots is now 1
Oct 20, 2016 13:59:06.450 [0x7f3d737ff700] ERROR - JobManager: child process returned: 1 (Operation not permitted)
Oct 20, 2016 13:59:06.450 [0x7f3d757fd700] DEBUG - Streaming Resource: Terminated session 0x7f3d7214c120:6dy1025u373cqwadhr1mwsif6r with reason Conversion failed. The transcoder crashed or failed to start up.
Oct 20, 2016 13:59:06.450 [0x7f3d627ff700] DEBUG - Killing job.
Oct 20, 2016 13:59:06.450 [0x7f3d627ff700] DEBUG - Signalling job ID 19619 with 9
Oct 20, 2016 13:59:06.450 [0x7f3d627ff700] DEBUG - Job was already killed, not killing again.
Oct 20, 2016 13:59:06.450 [0x7f3d627ff700] DEBUG - Stopping transcode session ihycrkn15pme9d6dk7k138fr
Oct 20, 2016 13:59:06.450 [0x7f3d627ff700] DEBUG - Cleaning directory for session ihycrkn15pme9d6dk7k138fr (/media/raid/Plex_tmp/plex-transcode-ihycrkn15pme9d6dk7k138fr-ca7900ff-b0f2-4fde-b5ce-2023af03461f)
Oct 20, 2016 13:59:06.451 [0x7f3d627ff700] DEBUG - Cleaning old transcode directories.
Oct 20, 2016 13:59:06.451 [0x7f3d75ffe700] DEBUG - Completed: [192.168.1.161:64077] 404 GET /video/:/transcode/universal/start?hasMDE=1&path=http%3A%2F%2F127.0.0.1%3A32400%2Flibrary%2Fmetadata

Any help is appreciated :)

Thanks
Kev