Has anyone ever torted a wonder mold cake vertically and did you have any issues doing it this way?

Thought I have never done it I don't see a problem.  Fill w/b'cream - that will hold the pieces together.  

Yes, I have cut the wonder mold cake and filled with buttercream. I never had an issue with it. The buttercream pretty much holds it together once you put icing on sides. Mine crusted and worked beautifully!!

This might be of interest:  http://iambaker.net/vertical-layer-cake-tutororial-surprise-inside-cak/