Here's one that briefly burned me today and I thought I had a blog post of it. If you've created Ncloth and a default preset isn't moving correctly it's most likely that you are not working to 1/10th scale.
Because Maya perceives 1 unit as 1 meter (when your prefs are set to cm's), they also built the cloth solver to solve at that scale. Under the Nucleus node there is a space scale attribute that can be set to 0.01 if you are in a pinch but I'd suggest to model to 1/10th to get the most predictable results.
**Here's a fantastic whitepaper on the Nucleus solver.