Bug with Unresponsive Popup SubVi

[Gryffin]

Hello,

I have long been contending with a bug with dynamically opened subvi windows not being responsive when opened 3 times (first two times are fine).
I attach a simple example demonstrating this bug, where "popUp.vi", when run, can dynamically open the SubVI by clicking on "Open Pop-Up":

The SubVI (popUp2.vi) is simply a button you press to close it:

The third time you go to press the "Continue With Bug Demo" button, it will be unresponsive.

Any explanation as to why this is occurring would be greatly appreciated. I have managed to get other dynamically opened subVIs to work without freezing up, I'm not sure why this one is.

[Gryffin · Accepted solution]

Seems I just didn't toy around enough....

All that is required is to add an "Unregister for Events" in the subVi: