>The focus point on my D5000 ssems to move to any of the 11 >points without me doing anything (at least to my knowledge). >Is it possible to lock it in place? or can someone tell me why >it is moving? I have noticed that if I am not carfull, the heel of my thumb will bump the focus point adjustment. I don't think that there is any way to lock it in place. It'a just a matter of keeping your hand from accidentally moving it.
What AF mode are you in? In the dynamic focus point modes(like 3D, Dynamic and Auto Area) pressing the OK button re centers the focus point. The manual point selection control is normally active so if you bump it, the focus point will change. Stan St Petersburg Russia
If you are a left eye shooter, you nose may be bumping the multi-selector, though I have not used the D5000 or D3000 enough to know if it is a problem on those bodies or not. If your nose is not the problem using a single AF point should solve the problem. Good Luck and Enjoy your Nikons!