Can't change the color of a line?

I have successfully changed the color and style of all the lines in my drawing except for a few. When I select the lines and go to the 'outline' section of 'object properties' it says that the line is the color and style that i want it to be, but on the picture itlself it is still just a solid black line?

earlier someone on the forum had recommended i change my view from 'wireframe' to 'normal' because i was having troubles with line styles and filling in objects. i assume there is some other lock on a layer or something? any thoughts!?

thanks so much