I’m having the same problem. I’ve cleared the cache, tried different browsers, different images, different posts, the usual…
It was working fine, and then suddenly it just jumps to the top of the page like you described. It may have been the update to 3.0.1 that broke it. But then, it may have been something else, I can’t remember exactly at what point it stopped working.
Did you manage to get it working again?