No problem, I had a feeling that might be the answer : )
I have noticed that if you export a instance of this panel, during launch the popup becomes activated (before launch is complete). In some cases this causes the instance to crash. Mac OSX 10.6.8 and OSX 10.7.5.
I have tried this with your original Popup Demo and the result is the same.
Here is some noise I organised into an acceptable format:
https://soundcloud.com/lfo2vco/a-dark-crystal