We know Google (& YouTube) is not a fan of Internet Explorer but now some Internet Explorer users are reporting that videos aren't playing in IE. Some users are getting an error message that says "Operation Aborted" and are then being redirected to a page on Microsoft.com with more details.
Liz from YouTube support started a thread at YouTube Help confirming the issue and saying they are working on a fix. Liz did say there may be a way for the videos to play. She said:
In the meantime, here's what I suggest as a quick work around so you're able to play videos without issues:
1. Try refreshing your browser a couple times. This should actually make videos play normally again without issues in Internet Explorer.
2. If the tip above didn't help, you could try temporarily switching to another browser (for example Firefox or Chrome) until the team has fixed the bug with Internet Explorer.
Thank you for your patience while the team's working on this issue. We hope to have everything back to normal soon!
So if you do get an error, try one of those tips above.
Forum discussion at YouTube Help.