TxtRange MoveToPoint does not work for some page.

Hi

I use the MoveToPoint in TxtRange without success for some locations in some pages. It works for some locations but not some other locations. For example, it works for the beginning of the following page, but not the bottom of the page. Is this a bug in Windows Browser Control? Please help me?

http://en.wikipedia.org/wiki/Cloud_Atlas_(film)

cnn.com 

Thanks,

Xin