-o option no longer works with folder in absolute path

[guygodin]

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The same command-line used to work a few weeks ago, it just stopped working with a recent update.
If the path is directly under a drive letter it works (-o "D:\"), but if there is a folder included in the path, it no longer works (-o "D:\Videos\").

Note: the folder actually exists and is writable.

Full verbose log pasted below.

youtube-dl.exe "https://youtu.be/rG4jSz_2HDY" -f bestvideo+bestaudio[ext=m4a]/mp4 -o "D:\Videos\%(title)s.%(ext)s" --restrict-filenames -v
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['https://youtu.be/rG4jSz_2HDY', '-f', 'bestvideo+bestaudio[ext=m4a]/mp4', '-o', 'D:\\Videos\\%(title)s.%(ext)s', '--restrict-filenames', '-v']
[debug] Encodings: locale cp1252, fs mbcs, out cp437, pref cp1252
[debug] youtube-dl version 2018.11.07
[debug] Python version 3.4.4 (CPython) - Windows-10-10.0.17763
[debug] exe versions: ffmpeg N-73219-gd62657e
[debug] Proxy map: {}
[youtube] rG4jSz_2HDY: Downloading webpage
[youtube] rG4jSz_2HDY: Downloading video info webpage
[debug] Invoking downloader on 'https://r3---sn-nx57ynlz.googlevideo.com/videoplayback?c=WEB&initcwndbps=1018750&signature=210B9D36D3F7B8C298100FDB16BEDEF73B5C47D1.7AA92137A3934E9A58D9775AB223897826992AAE&aitags=133%2C134%2C135%2C136%2C137%2C160%2C242%2C243%2C244%2C247%2C248%2C264%2C266%2C271%2C278%2C313&requiressl=yes&pl=19&fvip=3&ip=172.103.160.200&key=yt6&ipbits=0&id=o-AO1MfFhfgkSmCnb_Xr1WJK91Ytj9RxJsE2sBpGvVBpTM&ei=lPjkW4_UMYeLkwba2KSQAw&mm=31%2C26&mn=sn-nx57ynlz%2Csn-n4v7sney&dur=134.300&gir=yes&xtags=vproj%3Dmesh&lmt=1482396629802216&clen=303047027&mt=1541732426&mv=m&ms=au%2Conr&source=youtube&mime=video%2Fmp4&keepalive=yes&itag=266&expire=1541754100&sparams=aitags%2Cclen%2Cdur%2Cei%2Cgir%2Cid%2Cinitcwndbps%2Cip%2Cipbits%2Citag%2Ckeepalive%2Clmt%2Cmime%2Cmm%2Cmn%2Cms%2Cmv%2Cpl%2Crequiressl%2Csource%2Cxtags%2Cexpire&ratebypass=yes'
ERROR: unable to open for writing: [Errno 2] No such file or directory: 'D:\\Videos\\360_Great_Hammerhead_Shark_Encounter_National_Geographic.f266.mp4.part'
Traceback (most recent call last):
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\rg3\tmpj6iiia1g\build\youtube_dl\downloader\http.py", line 250, in download
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\rg3\tmpj6iiia1g\build\youtube_dl\utils.py", line 457, in sanitize_open
FileNotFoundError: [Errno 2] No such file or directory: 'D:\\Videos\\360_Great_Hammerhead_Shark_Encounter_National_Geographic.f266.mp4.part'

[dstftw]

Invalid path. Do not escape backslash.

[guygodin]

Invalid path. Do not escape backslash.

The issue still occurs with the backslashes not escaped. That's not the problem. I've re-pasted the log.

[dstftw]

Most likely the account youtube-dl is running on behalf of doesn't have enought permissions to write at this location.

[guygodin]

Most likely the account youtube-dl is running on behalf of doesn't have enought permissions to write at this location.

You are correct, I tried a different folder and it worked, sorry for the trouble and thank you for the prompt response!