Pop Up's and Right click menu items are not getting clicked on the my machine

Hi,

I am facing a peculiar issue with my TestLeft scripts. The actions like clicking on the right click menu items or the popup which were working fine are now not working. They fail to click on the menu item after right click. Most of my scripts are failing because of that. 

This is happening on the some machines. I have testleft version 12.50.4142.11 and Windows version 10 with latest updates.

Can someone throw light on what might be the issue?

Thanks