This is because the SubVI VPTS Proc Cmnd has an option "Suspend when called".
To cancel this
1.open the subVI,
2.click with the right mouse button on the subVI icon in the up-right corner of the window,
3.select "VI properties...",
4.choose category - Execution
5.and uncheck the option "Suspend when called".
Good luck.
Oleg Chutko