Synergy made it convenient to use a keyboard and a mouse across multiple machines. My setup involved using Mac OS X Lion as the server, and Windows 7 (64-bit) as the client. One of the most annoying and noticeable bugs of Synergy involved the inability to use SHIFT key on the client machines. Current version of Synergy as of this writing is v1.3.8 stable and v1.4.5 beta. Both these versions exhibit this symptom.

The temporary solution is to downgrade the server’s Synergy to v1.3.4 Mac OS X Intel 32-bit and the client to v1.3.4 Windows 32-bit. On Mac, I also used QSynergy as the front-end UI and set it to automatically start after login.