I have windows 10 and we recently upgraded to v12 from v8. Teamviewer is always set to start on startup and is visible in the System Tray. I pin the Icon to Taskbar and whenever I click it I get an error popup telling me another instance is already running. Not sure how I can just bring the computers and contact window. Basically the "Show Team viewer" command to bring th eapp to front from the taskbar icon.
It is really annoying 
