Struggling with something simple

I am trying to do a basic flag flapping in the wind. A couple of chaps on the Blender Stack Exchange have kindly offered advice but they seem to contradict each other.

So far I have got to the point where I have rendered my clip, but the flag has come out all distorted.

Here is the question: https://blender.stackexchange.com/questions/120552/basic-only-one-frame-is-played-after-rendering-and-how-do-i-make-my-plane-shee?noredirect=1#comment211071_120552

I have started again in making the flag, but it seems to come to the same issue.

Can anyone suggest a method to create this flag? Hope you can help. I’m feeling a bit defeated!

Have you seen BlenderGuru’s tutorial on a flag?


https://www.youtube.com/watch?v=Mwzz-Y6t-v8

Thank you so much! This is perfect to what I was after.