youtube "Watch Later" playlist not working anymore with Youtube-DL?

[MatrixView]

Make sure you are using the latest version: run youtube-dl --version and ensure your version is 2017.05.01. If it's not read this FAQ entry and update. Issues with outdated version will be rejected.

• I've verified and I assure that I'm running youtube-dl 2017.05.01

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What is the purpose of your issue?

• Bug report (encountered problems with youtube-dl)

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Possibly related to my previous issue-report on :ytsubs, the "watch later"-playlist isn't even found...
On the site itself (https://www.youtube.com/playlist?list=WL) it shows many videos.

Thanx in advance!

youtube-dl --no-check-certificate -u [user] -p [pass] https://www.youtube.com/feed/watch_later -v

[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['--no-check-certificate', '-u', 'PRIVATE', '-p', 'PRIVATE', 'https://www.youtube.com/feed/watch_later', '-v']
[debug] Encodings: locale cp1252, fs mbcs, out cp437, pref cp1252
[debug] youtube-dl version 2017.05.01
[debug] Python version 3.4.4 - Windows-7-6.1.7601-SP1
[debug] exe versions: ffmpeg N-67388-g37425fc, ffprobe N-67388-g37425fc, rtmpdump 2.4-47-gc26c541
[debug] Proxy map: {}
[youtube:watchlater] Downloading login page
[youtube:watchlater] Logging in
[youtube:watchlater] WL: Downloading webpage
ERROR: This playlist does not exist.
Traceback (most recent call last):
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\rg3\tmp0io2aq9r\build\youtube_dl\YoutubeDL.py", line 760, in extract_info
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\rg3\tmp0io2aq9r\build\youtube_dl\extractor\common.py", line 429, in extract
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\rg3\tmp0io2aq9r\build\youtube_dl\extractor\youtube.py", line 2504, in _real_extract
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\rg3\tmp0io2aq9r\build\youtube_dl\extractor\youtube.py", line 2046, in _extract_playlist
youtube_dl.utils.ExtractorError: This playlist does not exist.

[dstftw]

Duplicate of #12927.