Hi,
We observed this behaviour with TestStand 2014 SP1 (WIN 7) while using it for our validation needs. The problem is that we are not able to copy and paste the TestStand steps inside a sequences/sub-sequences. The 'Ctrl+C' and ‘Ctrl+V’ Keyboard shortcut stops working suddenly. It either starts working automatically after sometime or after a LabVIEW and TestStand restart or after selecting copy, paste options from edit menu. Because of this, we couldn’t copy & paste the steps in TestStand. Our guess is that copy is not working sometimes and that's why we couldn't paste the step.
So, we would like to check if it is a known issue and get your thoughts or recommendations. We appreciate solutions as well 
Thanks,
Srinivas