Skipping scenes?

I am making a presentation utilizing scenes.

I have made buttons to skip ahead doing something simple like this:

on(press) {
nextScene();
play();
}

This seems to work fine for skipping ahead.

However when going to the next scene trying to jump back using:

on(press) {
prevScene();
play();
}

Just starts the scene its presently on over.

Please Help.

Thanks.