This problem occurs on a Windows Vista system that's setup with 3 user accounts. User #1 is an Admin account. User #2 and User #3 are Limited accounts. Most video links play OK on this system for all three users. But some videos won't play at all. The videos that won't play appear as an all-black rectangle on the webpage (no video, no sound, nothing). The problem shows up though with only one specific user -- User #2. The same videos play OK for both User #1 (the Admin account) and User #3 (the other Limited account).
An additional symptom is that the problem occurs for User #2 only when trying to play these videos with Internet Explorer 9. If the user switches over to Google Chrome instead of IE9, the videos play OK.
Here's a couple links to two short sample videos that exhibit the problem:
- Problem Video Sample 'A': http://www.campingworld.com/shopping/item/seven-color-led-light-strip/59973
- Problem Video Sample 'B': http://money.cnn.com/video/technology/2013/08/23/t-steve-ballmer-microsoft-windows-1-1985.cnnmoney
Just for comparison, here's a couple links to two other sample videos that work OK for User #2 in both browsers (both IE9 and Chrome):
- Good Video Sample 'C':
- Good Video Sample 'D': http://www.usatoday.com/media/cinematic/video/2854519/terrorists-on-twitter-usa-now-video/
I've already gone into Tools -> Internet Options -> Advanced; and done a full Reset of Internet Explorer settings for User #2 -- including the "Delete Personal Settings" option. But it has not fixed the problem. I'm thinking that there must be some other user-specific settings for Internet Explorer that I'm missing; but I just don't know where to look. Does anyone have any ideas on what the problem might be here?