When using Netscape Navigator or Internet Explorer in At Ease 4.x or 5.x Panels or in Finder workgroup the application starts and then quits returning me to the Panel or Finder workgroup. Netscape Navigator or Internet Explorer do work in the restricted Finder and with At Ease off.
Solution:
Apple has been able to duplicate the situation where Navigator and Internet Explorer will either quit or cause the computer to stop responding when using At Ease versions 4 and 5 while File Sharing is active.
Disabling File Sharing on the computer does alleviate this behavior with either browser.