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Reporting as directed. It seems other reports had problems reproducing. Here I saw it on a multiple URL download which I aborted and restarted with --verbose, and it sucessfully reproduced with --verbose:
platinum-bar2:hls jhawk$ youtube-dl --verbose -t fYWktRuMDKM tT3iNIGwX4E Dw4fVoJi8ew o9V7M9Pa578 bCdKI5dGn9c yuAyxQr2LYE 5oOfoldid3I
[debug] System config: []
[debug] User config: []
[debug] Command-line args: ['--verbose', '-t', 'fYWktRuMDKM', 'tT3iNIGwX4E', 'Dw4fVoJi8ew', 'o9V7M9Pa578', 'bCdKI5dGn9c', 'yuAyxQr2LYE', '5oOfoldid3I']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2015.01.04
[debug] Python version 2.7.5 - Darwin-13.4.0-x86_64-i386-64bit
[debug] exe versions: ffmpeg 2.3, ffprobe 2.3, rtmpdump 2.4
[debug] Proxy map: {}
[youtube] fYWktRuMDKM: Downloading webpage
[youtube] fYWktRuMDKM: Extracting video information
WARNING: [youtube] fYWktRuMDKM: Skipping DASH manifest: ExtractorError(u'Cannot decrypt signature without player_url; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; type youtube-dl -U to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.',)
[debug] Invoking downloader on u'https://r17---sn-p5qlsnl7.googlevideo.com/videoplayback?ipbits=0&mv=s&ip=18.187.2.34&signature=2D1520EA01B80894B130958131F5D7531541BD9A.1BB4CD8A34B1505AB9E4EF57890747FBA43C17E8&sparams=dur%2Cid%2Cip%2Cipbits%2Citag%2Cmime%2Cmm%2Cms%2Cmv%2Cnh%2Cratebypass%2Crequiressl%2Csource%2Cupn%2Cexpire&source=youtube&mm=35&expire=1420448111&mime=video%2Fmp4&nh=IgpwcjAxLmlhZDA3KgkxMjcuMC4wLjE&requiressl=yes&ms=pm&mt=1420423248&ratebypass=yes&itag=22&sver=3&id=o-AP-FdkLRZuiZk-T0q5ibMcuJKUl4EdfhIfxAtMWtqIvv&fexp=900718%2C902410%2C924231%2C927622%2C932404%2C9405945%2C941004%2C942629%2C943917%2C946008%2C947209%2C947218%2C948124%2C949423%2C952302%2C952605%2C952901%2C955301%2C957103%2C957105%2C957201%2C959701&dur=7064.508&upn=yq1ANeKnWFs&key=yt5'
[download] The legacy of James M. Landis - Keynote and roundtable discussion-fYWktRuMDKM.mp4 has already been downloaded
...
[youtube] 5oOfoldid3I: Downloading webpage
[youtube] 5oOfoldid3I: Extracting video information
WARNING: [youtube] 5oOfoldid3I: Skipping DASH manifest: ExtractorError(u'Cannot decrypt signature without player_url; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; type youtube-dl -U to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.',)
[debug] Invoking downloader on u'https://r2---sn-5hnezn76.googlevideo.com/videoplayback?itag=22&id=o-AKHRSDF33mDGuaPgQuICoyW9OUv2VpmoP-DpBHAgOUwx&ratebypass=yes&ip=18.187.2.34&key=yt5&source=youtube&signature=0E3AD8C77693968DA4D79FD55D72017E97C0391A.913BE65435EC47607B0A56801972062EC1353EB2&dur=3302.016&mv=s&mt=1420425149&sparams=dur%2Cid%2Cip%2Cipbits%2Citag%2Cmime%2Cmm%2Cms%2Cmv%2Cratebypass%2Crequiressl%2Csource%2Cupn%2Cexpire&ms=pm&fexp=900718%2C902410%2C924231%2C927622%2C932404%2C9405945%2C941004%2C942629%2C943917%2C946008%2C947209%2C947218%2C948124%2C949423%2C952302%2C952605%2C952901%2C955301%2C957103%2C957105%2C957201%2C959701&expire=1420448674&sver=3&mime=video%2Fmp4&requiressl=yes&upn=6QpVBKcxxAk&mm=35&ipbits=0'
[download] Destination: Congresswoman Jane Harman at HLS - On the evolving threat of terrorism-5oOfoldid3I.mp4
[download] 100% of 784.11MiB in 03:15