Hi AYC, If the thread is v long, the browser can take a few seconds to download all of it. It can't jump to the right post until it's finished downloading it or got at least as far as the post it wants to jump to. So there can be a lag between the thread apparently displaying and the browser jumping to the right post. That's probably what's happening I'd guess.
so you're telling me to have more patience? are you my mother?
Tech is the father of all Mumsnet!
We know it's annoying to wait, but long threads will inevitably take longer to load than their shorter siblings. There's not much we can do about that, it's just something we all have to live with. Hope it's not too much of a bother for you. Just have a handy I suppose...