This sounds like the error we get if the user's APTCATPATH environment
variable value doesn't include a "%D" entry, which Editor replaces with
the location of its own catalog. Without a reference to this catalog,
Editor will not function properly at all, as it relies upon several DTDs
and/or schemas (such as the one for XUI) that are included with the
product.
Brandon Ibach
Lockheed Martin Space Systems
Cape Canaveral, FL
321-476-7051