Problem with styles and preview in browser

Hi,

I've experienced in Macromedia 2004 MX, the following:

1.- I prepare a page attached to a css, but the href I place inside the tag is
an absolute one ex:
<link href="http://www.domain.com/css/cssfile.css" rel="stylesheet"
type="text/css">

2.- When previewing the page using the temporal file previewing method, I get
the page without styles, and the html tag has been modified to:
<link rel="stylesheet" title="Disabled for previewing in browser:
http://www.domain.com/css/cssfile.css" type="text/css">

This behaviour is not present on Macromedia MX (2002), I have tested it there
and it loads the styles properly.

My questions are:
Is that behaviour normal?
How should I use temporal file previewing method and get the styles loaded at
the same time?

Thanks,

Alex