Sounds like you're on the music page trying to print out the dots. In this case notespacing refers to how the notes appear on the printout, not to the number of spaces you leave between notes when entering them as text. You alter this notespacing with the little spin controls at the bottom of the music page.

The printout part of abc2Win is not very good, and quite a few things will throw it - non-standard note lengths like G5/4 for instance. I think very long lines in the text input can also cause problems. I always start a new line every four measures or so to keep things manageable (It also helps you see where you are in the tune when reading it).

Don't give up, it's worth it when you finally crack the code.

Wassail! V