I have drawn some lines with the line tool in Photoshop CS6.
The lines are vectors on a shape layer.
If I select the line with path selection tool I can change the stroke colour, in the options panel at the top, but not the stroke width (if I change the stroke width nothing happens).
Is there a way to change the stroke width?
I think the problem you have is that your lines are set to stroke 'inside' so no matter what the pt weight you wont see a result. You need to click the line style next to the pt weight > then more options > then where it says align, set to center or outside. Hope that helps.