That's the problem with this thread. I saw 2 things talked about.
1. Apache global configuration settings back to default
2. Php.ini memory_limit settings back to default
I only ever saw #2 in the release notes or mentioned as being addressed.
At least 2 people here have mentioned a problem with #1 since the "fix". I personally have avoided upgrading to 84 since I hadn't heard anything specific about #1 and apparently it's till affecting people. I was planning on upgrading when I had time to make a note of all my global apache settings so they can quickly be reset afterward if things go wrong.
One would think when developers are changing where and how settings or stored, they'd do their best to make sure the settings are preserved in all cases. I just don't trust things right now.