I have suddenly got a weird problem with rendering pixel animations, which I haven't had before. Let me explain.
I will use this Mario sprite (a .PNG file) for demonstrating, below is a Print Screen directly from ASP 9, it's looking good so far:

When I render this Image, it's ruined by the blurry effect:

It's however easily solved, all you have to do is unchecking 'Antialiased edges' and 'Extra-smooth images' in the Export Animation window.

Now, the render is going to be nicely pixelated!... uh, wait, what?....

It is STILL blurry. I don't understand.
I have made pixel animations before with ASP, and the renders have never before been blurry if I unceck Antialiased edges and Extra-smooth images. But now, they are still blurry.
The only difference now to before I can think of is that I'm using Windows 8 (before I used Windows Vista) and a newer version of ASP (version 9).
So just to make sure this isn't a Windows 8 related issue, I tried to render on another computer with Windows 7 - But same problem there. I haven't tried to render again in Windows Vista though because I don't have that OS installed anymore on any computer in my office. (But really, why would the OS affect ASP's render result? I don't know, I just try everything possible to solve this issue).
I also tried to render in an older version of ASP (version 8) - same problem there.
I obviously need help with this. :(