Looks like they found a fix, Joe.   1. Open Synergy on the Server.   2. Click on "Configure Server".   3. Select "Advanced Server Settings" tab.   4. Check the "Don't take foreground window in Windows Servers".   5. Click "okay" and apply the changes.   This worked for me and I'm using a Windows 10 PC as my server and a MacBook (Sierra OS) and another Windows 10 PC.