I use screensharing from an iMac to a mac laptop for fairly extended periods. Every now and then I press some key combination (and I'm not sure what it is) on my physical keyboard that causes keyboard input to break. After pressing this key combo, I can only type capital letters using the shift key. Lowercase letters and backspace do not work. Only holding shift on my external keyboard (connected to the iMac) produces anything, and that's capital letters.
Disconnecting from the screen sharing session does not solve this issue. Only disabling and enabling screen sharing under the 'sharing' preference pane or rebooting the laptop solves it.
Does anyone know what key combo I might be doing that triggers this, and how to undo it without having to stop and start screensharing ?