Airport Utility 6.0 Doesn't Support My AEBS?

Question

I'm confused! Just downloaded Airport Utility 6.0 which came in through Software Update. I downloaded it as well as a firmware update for my Airport Express (7.6.1) which showed up on the graphical interface.
My wireless network is set up with an older AEBS (b/g) which is connected to the modem and a newer AX (n) in another room where it is also connected to my stereo system. My confusion is that when I click on my older AEBS in the new Airport Utility graphical interface, the window that opens says that it is not supported by Airport Utility 6.0. So, what does that mean? Has my wireless network changed? Am I only connected to the internet through my Airport Express? Please clarify, if possible.
BTW, I have two iMacs: one is running Lion (10.7.2) and the other is running Leopard (10.5.8). 

Answer 1

My catch-all list of Airport 6.0 & Firmware 7.6.1 problems:
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I've compiled a catch-all list of problems and changes with Airport Utility version 6.0 and FW 7.6.1. Some of the items may be relevant to this thread.
THE PROBLEMS WITH AIRPORT UTILITY 6 AND FIRMWARE 7.6.1:
Introduction: If you find AirPort Utility v6.0 too limiting or strange, you can ALSO install AirPort Utility v5.6, released alongside v6.0, to maintain all your previous capabilities. It works fine with both Airport g and n devices.
PLEASE NOTE: According to Apple you must FIRST install Airport Utility v6.0 in order to access and install Firmware upgrade 7.6.1. Do that first. THEN install Airport Utility v5.6 and use it instead if you prefer.
1) According to Apple's documentation, Airport Utility version 6.0 is ONLY for Mac OS X 10.7 Lion. It is NOT for 10.6 Snow Leopard. If you accidentally installed v6, you'll have to dig around in Apple - Support - Downloads for the previous relevant version for your devices and OS version. Here is the relevant page:
http://support.apple.com/kb/DL1483
2) The HELP for Airport Utility has been updated. When you first access it you may well be looking at the old Help. It is supposed to update itself spontaneously over the Internet. It took a couple minutes in my case. Be sure you are looking at the NEW Help before you start using it. One way to tell is that the list of help topics essentially doubles from what there used to be. Also, the very first topic in the NEW Help should read:
"Set up an AirPort device > Set up a new AirPort Base Station or Time Capsule"
3) The HELP has some WRONG information. Here we go:
3a) There is NO "Enable Guest Network" setting. You CANNOT create a guest network or name it or give it any settings. Why this is still listed in Help, I have no idea. Why the setting is gone: This is most likely because the technology behind guest networks, WPS, has been thoroughly CRACKED in the wild. Google "WPS cracked" for lots of documentation of the situation. It won't be resolved soon.
3b) I can't find any 'Setup Assistant". Everything is now manual. This is not to say that there isn't a setup assistant that appears when you FIRST set up your Airport device. I don't know.
4) After installing Airport Utility v6.0, there is no indication of the accompanying firmware update until you decide to run the new version. Even then, you have to click on the big icon of your Airport device and notice an 'Update' button about halfway down the popup window. You then have to assume that this button is telling you to update your firmware.
5) After you update your Airport device's firmware, you may well discover an ERROR subwindow popping up inside Airport Utility that says:
"An error occurred while updating the firmware. -6721"
Don't panic! All you need to do is go into your Wi-Fi settings, either in your menubar or the Network preferences, and turn OFF Wi-Fi, then turn ON Wi-Fi again. This is part of a long standing bug in Lion's Wi-Fi with which I bet you are already familiar, certainly up through Lion version 10.7.2.
6) Miscellaneous changes in Airport Utility 6:
6a) The keyboard command to manually change your Airport devices settings is GONE. You have to click the little 'Edit' button after clicking on the big icon for your device.
6b) There is no longer any summary window for your Airport device. You have to instead click on the big "Internet" icon for related data, then click on the big icon for your Airport device for local settings data.
6c) There is no longer any HELP advising users to EXPORT their settings. (The Help only talks about Import of settings). BE SURE TO EXPORT YOUR NEW SETTINGS! I did this immediately after both updates.
6d) MAC address filtering for Airport devices is GONE.
6e) All references to IPV6 anywhere are GONE. I have to assume the IPV6 settings are now entirely working and entirely automatic. Let's hope so.
6f) Signal and Noise data and graphs are GONE. Use Apple's Wi-Fi Diagnostics app instead. Apple have hidden it here in Lion:
/System/Library/CoreServices/W-Fi Diagnostics
6g) In order to access the menu items in Airport Utility, you have to first click on the big icon for your Airport device.
--> No doubt there are other changes, oddities or bugs related to these changes. But this is what I came up with during a cursory strafing of the software.