Using Version: 1.2.1.0 (I know.. I know..)
Every time I try to add a link in a label field with a dynamically generated querystring parameter the formatting seems to be messed up.
For example:
1) add a label to the form
2) modify the label
3) Click "Link"
4) Add http://google.ca?q=test to the address field
5) add "link" to the "Hyperlink text to display" field
The link is displayed as HTML in the label (<a href...etc)