Anti-aliasing inaccurate (how is the X update coming along?)

[eobet]

I believe this is my third topic describing an inaccuracy with Xara X (use search if you wish to see the others).

So, computers used to be a bit slower, and Xara might have had to cut corners in order to get it fast.

But today, they should be able to incorporate more accurate calculations, and still have the application feel fast.

Here's the current thing I'm working on. On the left side, I turned off anti-aliasing, and the meridian's color is correct, but on the right side, the color is somehow darker than it's supposed to be: