Sitting with your legs crossed is bad for you
So yes, sitting crossed legged can create changes that are not always beneficial. That being said, when you look at the research even more, the problem is not really sitting cross-legged, the problem is sitting in ONE position for long periods of time. So sitting in ANY position for too long can cause problems, not just cross legged. What we really need to do is MOVE more often. And if we do have to sit, changing positions regularly is going to be the most beneficial.