Note from moderator:

The "x" parameter item type was not working in this initial release of 2010. Requesting a "password to continue" in this manner would produce a blank page. This has since been fixed as of 2010.2.19, posted Feb 17, 2011.

See also Version History for v2010.2:
http://www.empirisoft.com/Support/showthread.php?t=5577