I'm sure I reported this problem to Macromedia, and will do again since release
3.11 does not fix it.

Using Contribute to create links to pages with a querystring is the issue.

We use & to separate querystring variable. For valid HTML all & need to be
encoded as &

When creating a link the & are at first manually encoded as & and appear
correctly on the page when published.

If I then go back into edit the link, it has lost the encoding.