I have a problem that worries me, because I do not know the source. Use the Win 7 Ultimate 64 bit and I have an ATI HD 5770 with Catalist 10.12. In versions 2.5 x when attempting to select a vertex or edge or face occurs from the selection if give elsewhere, instead of the selected point. I use version 2 .49B and it works very well. Forum blenderartits I saw someone else with the same problem and advised to update the video driver. So I said what I'm using in the video, but this did not solve the problem. Which can be the source of the problem? Will they wont use the final version of Blender 2.5?
All help is very welcome.
The usual problem with wonky selections is Full Screen Anti-Aliasing (FSAA). Turn it off.