My MacBook Air (2011) and my iMac (2008) can no longer see each other.

Hi
My WiFi is via a TimeCapsule which seems to work perfectly well with the Apple TV, Hot plugs for the TV and my iPhone/iPad but my two computers (above with Mavericks operating system) can't see each other any more. It's been about a week now. I have restarted both of them but to no avail. My MacBook Air has alternate backups to a local USB connected hard drive and Time Capsule and both are working fine. I've tried looking in System Preferences to see if something's turned off but can't find what I'm looking for. I tried changing the settings in Airport Utility but that made things worse so I've reverted to the original "Bridge Off" mode. What has happened or have I inadvertently turned off?
Many thanks
Sue Clark

Ralph Johns (UK) wrote:
Hi,
I can see that Accounts/Screen Names can get messed up on the various flags set by an App to and therefore On the AIM servers.
What I can not see in this case is why it seems to be limited to just one Buddy on each computer.
As the Block list (And therefore presumably Allow Lists) are not actually shown in the .p0list I ma hoping that deleting it and restarting ichat at one end at least will reset that iChat form the Defaults haled in the app when you do this.
(you could delete that Account Screen Name from iChat ? Preferences > Accounts to achieve the same things in a more destructive way as it would tend to rewrite all the .plists which may included Jabber ones that are OK
We both did delete our screen names in iChat, and also deleted ALL the prefs manually.
Also, we've tried using entirely different computers to log-in to those same accounts, with the same results - somehow we're blocked from each other.
I think we're both giving up at this stage. We have additional accounts we can use to see each other. But it would be really nice to get to the bottom of it, because if it happens once it can happen again. Who knows? Maybe there are other people in my buddy list that this is happening with right now, but we don't know it. This person just happens to be someone I chat with a lot, and we noticed we weren't seeing each other.

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