As an ongoing issue (for at least the past three major OS X versions), I find that when trying to remote to another machine using Screen Sharing, the remote screen gets painted completely black. Moving the mouse will result in the area immediately under the pointer being redrawn correctly, and dragging a window (in the remote session) off screen then back on will redraw that window. Sometimes other areas of the screen will redraw themselves (usually when there is an actual change), but most the screen simply remains black, sometimes even repainting back to full black again.
Network connectivity doesn't seem to be a factor; this happens both on a fast LAN and across the Internet with 400-500ms latency. Hardware doesn't seem a factor either; using a range of Mac Minis and Macbooks. Screen sharing sometimes initiated via Remote Desktop, sometimes just clicking on Share Screen in the Finder. While I can work around this glitch (I tend to just SSH in for maintenance), I thought I'd see if anyone out there has any suggestions!