I don't know what the hell this is.

Got a new computer with vista on it ( :/ ) and installed my Photoshop 7 on it.

Started a new project and saw something really weird that never happened before:

Can't really see with the gaussian blur, but there are pixelated lines there!

What the hell is up?
I don't even know what key words to search for over the internet.


Anyone has an idea?