VBO problem

Hi all.

VBO extension spec says it is possible to use separated bindings for individual vertex attribute, right? I’v tried this in my project but it didn’t work.
I do it like this:
Bind buffer 1;
glVertexArray (…);
Bind buffer 2;
glNormalArray (…);
… …
glDrawArrays (…)

if I use one binding for all attribute, it works fine. where is the problem?

Please do not cross post. I already answered this in the beginners forum. thx.