解決済み
videos will not play only on nbc.com
windows 7, 32 bit google chrome, flash player 11.2.202.235, none of the videos on nbc.com will play the video window just remains black
このトピックへの返信は締め切られました。
If you're seeing video fail on one and only one site, it's probably not Flash. All of the relevant major commercial video uses H.264 video, which is working fine. There *is* an issue that affects video playback with the Nellymoser audio codec, but Nellymoser is typically present with the On2/VP6 video codec, so it's primarily relevant for things like cam chat sites. If you're watching modern video (Hulu, YouTube, etc), this would not be the problem.
My guess is that either there's a problem between you and NBC, or you have a third-party plugin that's preventing the page from working as intended. For sites where commercials pay the bills, things like ad-blockers and anti-tracking plugins can frequently break playback.
To narrow down the root-cause, work through the video troubleshooting guide and report your results:
https://helpx.adobe.com/flash-player/kb/video-playback-issues.html
It's fixed! I deleted everything Adobe on my machine and made double sure that all registry items related to Adobe were gone and everything is back to normal. Thanks you all for your patience with me. Now I wonder which Adobe things were conflicting. I suppose I'll find out when I have a need for the pdf editors etc. and put them back in. 
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