Recently, we’ve had a few customers write in to mention that they are having a problem with their Screen Sharing in Leopard after the 10.5.5 update. Specifically, the first time trying to connect via the Screen Sharing application will return a small, match box sized window with only black. (pictured below.)
Luckily, it turns out there is a quick fix. In all cases, we found that restarting the local Mac (the one running the client, not the remote Mac running as the server) will fix the problem.
I hope this saves others from the headaches of troubleshooting. Sometimes it’s the most simple answer of all.