Are you sure you're using Flow Layout? It sounds like you're using Grid layout...

As to browser incompatibilities. ASP.Net doesn't work very well with Mozilla because it treats it as a downlevel browser (even though it's not). I can't remember if Netscape acts the same or not. There's a quick fix for this which basically kills browser sniffing and always uses HTML 4.0 and CSS:

  <system.web>
...
    <browserCaps>
         TagWriter=System.Web.UI.HtmlTextWriter
    </browserCaps>
  </system.web>

The security issues I'm not sure about. Make sure that Windows Authentication is enabled on the Web Server - it sounds like there are permissions problems. IE will logon and do this automatically but Mozilla/Netscape need the proper protocol support for this. In fact, Mozilla 1.5 is supposed to have the same Windows Passthrough support that IE has...

+++ Rick ---

>Hi,
>I have a web form designed using flow layout. When I view the web form using various versions of Internet Explorer on a PC and a MAC, everything looks great. However, Netscape 6 on a MAC shows me a blank screen and never prompts me to logon. Netscape 7.0 on a PC and Netscape 6.0 on a PC give me the following error message: "You are not authorized to view this page." which displays before I even get the logon prompt. Also, Mozilla on a PC moves all my fields around causing the entire page to be distorted just as in Netscape 7.1 on the PC. And, finally, Opera 7.23 on the PC gives me the following message, "The server requested a login athientication metod that is not supported. (and it listed the IP address)"
>Overall, I'm not having much luck trying to view my web form across different browsers. Any suggestions?? Any help??
>
>Thanks so much!