I'm used to not having my splines anti aliased. I cant recall what settings I have set that made them like this. I've tried both OpenGL and Direct3D, also tried setting "Antialiased Lines" ON and OFF under OpenGL (not sure what those settings do though), but no luck. I've also updated my Graphic Card drivers

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There should be an option in either an Opengl or Direct3D tab (depending which you have selected) in the options.

I tried that for OpenGL (which is what I always has used), setting "Antialiased Lines" to both ON and OFF without any luck (even restarted A:M after the changes). I'll see if there is such an option for Direct3D when I get home from work

If that doesn't do it, maybe there's a setting in your graphic card options (right click on the desktop>properties).

Why do you want to turn off anti-aliasing? Does it make your computer slower?

I have better visual control over the splines when they are "solid", but that is a personal preference i guss. Btw i managed to fix it by a total uninstall/reinstall but only with direct3d (i used opengl before), and direct3d is slow and buggy on my computer