I've just updated to OSX 10.9.
Sounds in the timeline don't work anymore. At all.
When I even just try to move the cursor, a terrible corrupted sound starts and won't stop until I force close Flash.
I was working on an important project, I guess it was stupid of me to update to the latest OS without waiting, but the Adobe FAQ said that everything was alright.
The buzzing sound issue was reported by some users on OSX 10.8 too, so I dont think this is entirely specific to OSX 10.9. However this should be fixed in the next update that will be coming soon.
+1 with this issue. Just installed Flash CC after updating to Mavericks and I cannot use sounds on the timeline. They are set to stream, but I just get static and also the playhead stops too. I hope the fix is coming soon, been over ten days since this post.
The new update came, and IT DIDN'T FIX THE PROBLEM!
ADOBE, WE CAN'T WORK AT ALL. It's ADOBE's fault, we've updated because YOU told us it was safe when it wasn't.
This is NOT professional.
The new update(Flash Pro CC release - November 2013) that has a fix for this OSX 10.9 buzzing sound issue is now available to you. This Flash CC update will update your flash version to 220.127.116.11.
You can update from the Adobe Creative Cloud application or from Flash Pro CC Help -> Updates menu.
You will more information on the update at: http://helpx.adobe.com/flash/using/whats-new.html