Problem with setting strides on vertex buffer

Setting the last argument of glVertexAttribPointer (the pointer offset) 
to anything other than None seems to cause the vertex buffer to not work 
(at least, I don't seem to be able to render it - that's about as far as 
I'm competent to debug).

Using pyglet.gl seems to work fine, but PyOpenGL not so much.

Cheers,

Henry

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