In order to cut, copy, and paste in the Mozilla Richtext editor... you'll need to modify your Mozilla/Netscape browser preferences.  Here are the instructions:

  1. Close all currently opened Mozilla or Netscape browsers. Close Quick Launch if it's running.

  2. Look for user.js file in the following directory (if user.js doesn't exist, create one)
  Windows XP:
  C:\Documents and Settings\\Application Data\Mozilla\Profiles\\*.slt\
  Windows 98:
  C:\WINDOWS\Application Data\Mozilla\Profiles\\*.slt\

  3. Open user.js file in a text editor, and add the following lines:

  user_pref("capability.policy.policynames", "allowclipboard"); user_pref("capability.policy.allowclipboard.sites","http://premium.xanga.com"); user_pref("capability.policy.allowclipboard.Clipboard.cutcopy","allAccess"); user_pref("capability.policy.allowclipboard.Clipboard.paste","allAccess");

  4. Save the file, and restart Mozilla or Netscape. The Clipboard buttons should now function.