The Problem

Pasted URLs with don't seem to work in the web system if they have ampersands ("&") in them.  This is caused by the visual page editor, which takes each "&" and transforms it into "&" when the page is saved, breaking the link.

The Workaround

1. Click the Edit tab for the page.
2. Click the "Edit without visual editor" link below the body text window.
3. Scan the links in the source code for any instances of "&" and then reduce those to just "&".
4. Save the page.

The link should now work.