UPDATE - The drama is over. Firefox wasn't the culprit - it just looked like it could have been. I'm leaving all the posts for the Forum's amusement - and my final post on here is like a murder mystery story.
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This is a catastrophe, and so far, nothing I'm doing is fixing the problem.
To cut to the chase, the most recent Firefox update, 19.0.2, was installed yesterday. Immediately I lost sound everywhere. Sonar won't function, ARIA won't function in stand alone. (EDIT - I discovered I can play MP3s and video - it's "just" all music production items that no longer work.)
The problem could be rare, directly related to my slightly elderly sound interface, Alesis iO|2. All I know is that I've tried things over and over since yesterday afternoon, and I'm dead in the water.
Very unfortunately, Firefox doesn't offer an easy way to just roll back to a previous version. They purposely prevent you from doing that. So using a restore point on my computer had to be my option - I ran that, going back 2 days. Everything worked fine - for about 2 minutes - then Firefox went through an automatic update, bringing me back to 19.0.2 again.
ARGH! I forgot that I had auto updating checked, did that a long time ago - STUPID - Now I have the option checked to be notified about Firefox updates, and I'll choose to do them or not.
So I needed to do the restore point routine again.-- But it failed. In fact, it's now failed 4 times - none of the restore points work, error message comes up at the end. I've re-booted the computer a million times - nothing's shaking loose.
---I guess I have to do the more drastic thing of finding an older version of Firefox, installing it, and losing all my plug-ins, my layouts,- I have so much customization on this. I'm freaking out.--- Plus, I can't find an actual old version to install -- I see some listings, but I have no idea how to install them - I'm seeing just folders of components, no installer provided.
Something has to work out - But it's The Worst - I was set to do mixing on a new project this weekend. But here I am tearing my hair out over this.
If anyone has any input, it would be much appreciated.