Screen sharing in Yosemite - lots of weird graphical artifacts
I have Yosemite installed on both my MBP 2013 Retina and a brand-new Mac Mini (headless). I control the Mini from the MBP with standard built-in screen sharing. It works, but visually it's really bad! Often the remote menu bar goes black, and only repaints (in sections) if I hover the mouse over it. Often the toolbars of various windows take on the color of the desktop and do not display any of their widgets - again until I hover over them. Dragging windows sometimes leaves permanent "trails" and other graphical residue.
The Mini is pretty much running on default settings (although I did set it up by cloning the backup of my previous Mini). In particular, I've not activated any Accessibility options, nor am I using the "dark menu bar" general option.
Is anyone else seeing this? Or can someone suggest some troubleshooting?
MacBook Pro (Retina, 15-inch, Early 2013)
2.4 GHz Intel Core i7
8 GB 1600 MHz DDR3
Intel HD Graphics 4000 1024 MB
10.10 (14A389)
Mac mini (Late 2014)
2.6 GHz Intel Core i5
8 GB 1600 MHz DDR3
Intel Iris (null)
10.10 (14A389)
MacBook Pro (Retina, 15-inch, Early 2013), OS X Yosemite (10.10)