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After waking my desktop Mac from sleep today I went to watch a video on YouTube. The volume was very low even though I turned it up all the way. I restarted the Mac but nothing changed. I played the same video in Google Chrome and it was fine. Other Mac sounds such as beeps. etc. are fine outside of Safari. The problem seems confined to Safari 11.0.2. I'm running OS X 10.11.6. I replaced the Adobe Flash Plugin but that didn't help.
Mac Pro, OS X 10.11
Try setting up another admin user account to see if the same problem continues. Please post back on whether or not this worked. Also try the Safe Mode. Please post back on whether or not this worked.
Isolating an issue by using another user account
If it works in the Safe Mode, try running this program when booted normally and then copy and paste the output in a reply. The program was created by Etresoft, a frequent contributor. Please use copy and paste as screen shots can be hard to read. Click “Share Report” button in the toolbar, select “Copy to Clipboard” and then paste into a reply. This will show what is running on your computer. No personal information is shown. If the log won’t post, try posting it in Pastebin and provide a link in a reply Pastebin
Found the problem. It was simply the volume slider in YouTube!
P,S. It seems it may just be in YouTube... Vimeo seems fine.
Volume in Safari Low All of a Sudden
