RollOver/MouseOver cursor change bug in external loaded swf

I have a master movie with navigation that loads a external swfs. The external swfs serve different purposes and typically have a series of buttons that navigate the timeline. The external movies with their buttons work fine running individually. When the movies are loaded through the master movie, the buttons in the external movies looses the cursor change on rollOver. These are basic invisible hotspot - button symbols. The buttons typically navigated to different frames. I am curious why the cursor change fails when loaded through the main movie, but works when run on its own.

I have done some searching in Google, but didn't find a similar issue. Any ideas? Throughout all the movies, I probably have over 200 buttons, I don't want to create rollOver and rollOut cursor changes for each. Again, these are basic button symbols.

Any clues?

Dave