I was recently looking at a Google Analytics Site Overlay (a very nice feature if you haven’t seen it before) and noticed that almost all links are showing up as 0% click-through. I know this couldn’t be the case because the the bounce rate for that page was 32.75%; the numbers just didn’t add up. After digging through some help pages, I found the following: (http://www.google.com/support/googleanalytics/bin/answer.py?hl=en&answer=66982)
We do not support characters from character sets other than
UTF-8. If you have other character sets on your site, you may see
garbage characters (usually empty boxes or question marks instead of
the actual characters) in the report.
Many of these URLs that contained (&) for the ampersand instead of the (&) which Google Analytics is much happier to see.