After investigating I found this is a javascript bug that occurs only in IE, and only when clicking the "needs approval" link sent to administrators for new users. It happens when invoking the dialog and causes some of the controls - such as the e-mail textbox - to not be filled in and renders the Save/Close buttons inoperable. The e-mail address is stored in the database correctly - it just isn't showing for you. I fixed the bug and it will be included in the next release. Meanwhile, there are three easy workarounds (take your pick):
1. Use a browser other than IE.
2. When the page loads, click the Manage Users link in the menu at left. Then click the Edit button next to the user you want to approve.
3. Open the file \gs\pages\admin\manageusers.ascx in a text editor. Look for the FIRST instance of this line:
AnimationType="Outline"
Change it to this:
AnimationType="None"
Roger Martin
Creator and Lead Developer of Gallery Server Pro