Just found a solution for a issue that has been bothering me and many of my friends, for as long as I've known what a vector drawing is.
Since I'm a vector fanatic this is great news.
Ok, here it is:
You know when you open a nice vector drawing in Acrobat and it looks messy with all fat lines, like image no.1, but in your vector software it looked fine, like image no.2
Just go to Edit/Preferences/Page display/ and make sure that enhance thin lines is un-checked. Problem solved forever, but unfortunately only on your machine, i.e. it doesn't apply to the document.
