Some people who have applied the recent Remote Desktop Client 3.3.1 update have had problems with screen sharing between their Macs, with the connection being established properly but resulting in a blank window and no way to view the remote Mac.
Utilities Updates: Cocktail 3.6; OmniWeb 5.5 beta 3; NetRestore 3.3.1; IPNetMonitorX 2.0.4; more
Utilities Updates: Tracker 1.0; DMG Packager 1.3.1; SteerMouse 3.3.1; OmniWeb 5.5 beta 1; more
Utilities Updates: Safari Enhancer 3.3.1; QuickSync 3.0FC2; rooSwitch 1.0; iPartition 1.5.1; more
Utilities Updates: iClip 3.6; System Optimizer X 4.7.2; XPostFacto 4.0b4; File Juicer 3.3.1; more
Resolving AirPort 3.3.1 no-access issues
Utilities Updates: IPNetRouterX 1.0b4; Synchronize! Pro X 3.3.1; more
AirPort 3.3.1 update fixes "kernel panic on Location change" issue?