I upgraded from Airport Utility 5.5.3 to 6. on a bran new MackBook Air running OS Lion 10.7.2.
Then I upgraded 1 Time Capsule and 2 Airport Express (All 802.11n) from firmware 7.5.2 to 7.6.
After that I had issues with mac adresses acces control on the 3 devices : Every change made on either one of the 3 devices would automaticaly be duplicated on the 2 others ...
This is the correct behaviour. When you set up multiple AirPort routers correctly they form a Wireless Distribution System (WDS). In this configuration you only configure things like MAC address access control on the Main router. The other routers will follow the behaviour of the main one.
As I had kept the Airport Utility 5.5.3. on my Imac, I could easily downgrade my 3 airport devices to 7.5.2. Firmware (This option being no more avaliable in Airport Utility 6.) and I could go back to normality as far as mac adresses acces control are concerned on the 3 devices.
For the MacBook Air, the only solution I found was to restore my system from a Time Machine backup to go back from Airport Utility 6. to 5.5.3.
I am a bit confused ... Can I stay under Airport Utility 5.5.3. and Firmware 7.5.2 and eventually be able to upgrade later to a new release supposed to have this issue solved ?
You were suppose to update from Airport Utility v5.5.3 to v6 and download the separate AirPort Utility 5.6 and update your firmware to 7.6.1.
What about OS Lion 10.7.3. above all this ?
I am a bit reluctant to install it ...
Like many others I have been struggling with Time Capsule / Time Machine Issues since OS Lion 10.7.2. upgrade, (Just solved a few days ago by a user post forwarding an Apple Care workaround) and I am kid of split between the habit of being always up to date on all my devices, and the fear to get into months lasting troubles.
If you are having issues with Time Capsule / Time Machine it is a separate issue. I also have a Time Capsule and use Time Machine. I did not have any problems before the update and do not have issues after the update.
You need to solve your issues but do not think they are specific to any update, they must be tied to another error on your system.
How is it possible to have two different releases of the same Airport Utility installed on the same system ? (See NyKon post above) Is it a secificity to Airport Utility 5.6 and 6 ?
Apple is re-writing the AirPort Utility. Version 6 is the new version but is not complete yet. That is why they also released version 5.6.
Before restauring my system on my MacBook Air to to go back from Airport Utility 6. to 5.5.3., I tryied to download 5.5.3. from Apple site, it would successfully get istalled but 6. was still the only one running.
Thanks for your help, and I apologise if some of my questions may sound a bit naive to you ...