While it will be irrelevant to whatever your problem is, there is no need to have two function to do the same exact thing. You can have the two buttons share the same function.
As for whatever the problem is, I am not able to get what it is from your explanation. If I am attacking the correc buttons, both of them apparently want to open up a popup window, which I don't allow for.
If you are changing frames, then it is always possible that you are ending up somewhere where the the buttons no longer have code assigned to them.
I think I've overcomplictated my inquiry. So, I'll try to give a brief explanation this time.
I'd like two buttons to open a single MC. One button works and the other (the thumbnail) doesn't work when initially previewing the swf. (it works only after it is directed to the bext frame label.)
My last sentence in the original response may still be applicable. How do you have the code assigned relative to timeline locations?