Windows don't repaint correctly over VNC connection

Number:rdar://19382113 Date Originated:1/5/2015
Status:Open Resolved:
Product:OS X Product Version:10.10.1
Classification:Serious Bug Reproducible:Always
Windows don't repaint correctly over a VNC connection. Portions of windows don't redraw and pieces of other windows are left around on screen.

Steps to Reproduce:
1. Connect to a system running 10.10.1 (14B25)
2. Use it for awhile

Expected Results:
The windows should repaint correctly

Actual Results:
Eventually the windows will fail to repaint.

10.10.1 (14B25)

A workaround is to disable beam sync in Quartz Debug. After the beam sync is disabled, the windows repaint correctly.

Note that I can't take a screenshot of this because doing so causes all the corrupted windows to repaint.

This problem looks like the same thing that happens when using a virtual machine (like VMware) on Yosemite:

Both my wife and I do tech support for the other members of our family using Screen Sharing. Until this bug gets fixed, no one in our family will be updating to Yosemite.


Please note: Reports posted here will not necessarily be seen by Apple. All problems should be submitted at before they are posted here. Please only post information for Radars that you have filed yourself, and please do not include Apple confidential information in your posts. Thank you!