WP 4.4 Safari scrolling problem, also audio embed problem

Issue: Out of control scrolling in the editor
WordPress: 4.4
Full-height editor: disabled
Mode: Visual
Browser: Safari 9.0.2
Platform: Mac OS X 10.11.2

If I click and drag in the edit window full of text the scrolling is out of control. If I try to drag-select some text down the window scrolling immediately goes full-speed to the bottom of the text in the edit window, same if I try to click/drag up. Makes it impossible to select text while in Visual mode.

Workarounds: Switching on full-height editor in the Screen Options avoids this, switching to Text instead of Visual editing works, Google Chrome works.

Issue: Audio embed players don’t work
Browsers: Safari & Chrome (Mac OS X)

Embedded audio players no long work. No indication of any player is shown on the published post page. I am using CloudFlare but not the CF plugin as my host automatically puts sites on CF.

Previous posts that were fine and showed the player for mp3 files I’ve uploaded under WP 4.3 no longer show the player, it’s as if no code has been inserted at all. Not even any trace of code shows up visually on the post page. In the post source I find ‘visibility: hidden’ See below for the source of published post code.

<script>document.createElement('audio');</script><![endif]-->
<audio class="wp-audio-shortcode" id="audio-111899-1" preload="none" style="width: 100%; visibility: hidden;" controls="controls"><source type="audio/mpeg" src="http://cf.hawaii247.com/wp-content/uploads/2015/12/20151207-1400-hccd-dengue.mp3?_=1" /><a href="http://cf.hawaii247.com/wp-content/uploads/2015/12/20151207-1400-hccd-dengue.mp3">http://www.hawaii247.com/wp-content/uploads/2015/12/20151207-1400-hccd-dengue.mp3</a></audio>