Hi Chris, I'm one of the Vista users who had no audio whatsoever after upgrading to 11.3 last week. I've just followed the steps above about changing the Default Format to 16bit 44100 Hz for my speakers, and I can confirm that audio is working fine for me now with Flash videos on YouTube.

Before changing this setting I upgraded from 11.2 (to which I had downgraded last week) to 11.3.300.262. Then I changed that speaker setting, restarted Firefox, and tested a YouTube video and the audio worked.

Unfortunately I didn't think to check if the audio was working with 11.3.300.262 before I changed the speaker setting - it would have been nice to know.

In any case, after my test, I did then change my speaker setting back to what it originally was (16 bit, 48000 Hz DVD quality), restarted Firefox, and the audio still works just fine. So that makes me wonder if the speaker setting really is the culprit after all. It seems that 11.3.300.262 fixes the bug and it doesn't matter what my speaker setting is set to.

After updating to 11.3 I have no sound in any flash videos, and flash videos play at 3x speed. Forcing youtube to instead play in HTML5 resolves the issue.

I've since rolled back to 11.2, and am no longer experiencing the issue at all in Firefox.

Sound is only missing when I plug in my USB speakers. If I unplug the USB speakers and instead just use the on-board laptop speakers then sound works just fine and flash videos play normally.

Tried the suggested Default Format fix, and found out something interesting. The Default Format (for the USB speakers) is locked at 16bit, 46875Hz. The  drop-down box is greyed-out.

I still cant get sound to work on chrome. Have submitted bug data and tried multiple fixes I need help please!

Hi, I just now followed your (very clear, thank you) directions for NO SOUND in Vista or Windows7, and it did make a difference.

So, the only change I made was to reduce the output from 48000 (DVD quality) to 44100 Hz (CD quality)... and that did the trick. Hmm... using FF on Vista HP... also now working in IE... and Opera 12!

Thank you.

Hi everyone, previously my surround sound(5.1) did not work while playing Flash videos in Youtube or otherwise. Sound would only play from the Front Left/Right and Center speakers but not the Rear speakers. My sound card(Creative X-Fi) uses X-Fi CMSS-3D to convert 2.1 channel sound to 5.1 and it used to work fine until about a month ago before this release. Strangely, before this latest update, the rear speakers worked while playing Flash videos in Internet Explorer but not Chrome or Mozilla. Disabling the Flash Plugin for Chrome restored surround sound but certain videos(I suspect those with ads) did not play at all.

Solution: I used Chris's solution for no audio(wierd, because audio was working for my front speakers) after updating to 11.3.300.265 and changed my default format to 16 bit 44100 Hz(Studio Quality) and all sound channels worked again in all browsers. After playing around a little adjusting the formats, 24 bit 44100 Hz(Studio Quality) also works perfectly but not any other format, 48000 or 96000 Hz.

Having the exact same problems with my Logitech headset as well. Worked fine until today.

Aha! I finally found a fix. I located Shockwave_Installer_Slim.exe, which is probably the beta for 11.6. That worked. Sound is back, good as ever, and it has only taken me about 3 hours to get here.