The VirtuaWin tray icon will flash when a program becomes unresponsive and hangs.
In Windows 10, this happens frequently with all of the Windows 10 apps, like Mail & Calendar, Movies & TV, etc. While removing and uninstalling these apps is one solution, you can do a one time fix using VirtuaWin:
- Right click on VirtuaWin tray icon.
- Select Setup
- Go to the Modules tab
- Select WinList
- Select Configure
- Sort by the “S” column
- For all rows tagged with “H”
- Select the row
- Select Restore
Sources
This doesn’t work, nor disabling VM’s handle on this: [How to disable flashing VirtuaWin systray icon? Window is not responding](https://superuser.com/q/360696/301042)