Instruct: Classify Amazon reviews into positive or negative sentiment
Query: DVD does not work on computer

I was excited to try this DVD as I have done Xtend Barre at a studio for awhile. I bought quite a few barre/fusion/pilated DVDs with this order. I purchased two Tracey Mallette DVDs and neither one would work on my new Macbook Pro. The other DVD's worked so I know it is something with the formatting of this series that will not work on Mac's DVD player. Just thought I would give a heads up to anyone who plans to follow this workout from their Mac or computer. BUMMER!