Middle click and drag does not work on Unity3D

[Chanyut Leecharoen 0]

Hello, I have configured my Windows PC as Synergy server, and my Macbook as Synergy client. I have a problem, I cannot drag mouse to pan camera in Unity3D Engine which is running on Mac. It seems like Unity3D itself cannot detect drag mouse event. I have already tried another mouses, but the issue still exists. I am not sure this happens in other applications or just only Unity3D.