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This is what it looks like:

enter image description here

I've looked through the browser settings to see if there's an option to disable auto downloads, but there seems to be no such option.

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up vote 0 down vote accepted

I believe what's happening is that Youtube is trying to start up their "Google Frame" plug-in for HTML5 enhancements.

It also seems to have something to do with YouTube linking to your Google+ account.

Log out of (all) Google services, clear your browser's cache, and log back into your Google account..

More info from Google Groups:

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Signing out, and then re-signing in resolved the issue. Thank you for your help. – Acid2 May 29 '13 at 17:25

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