iMessage is not working on my mac.

the problem also applies to facetime

I don't know how this worked, but frankly, all I care about is that it DID work! Thanks for the weird-but-working solution!

 ▹ System Preferences… ▹ Flash Player ▹ Storage

and click

Block all sites from storing information on this computer

Close the preference pane. If this action solves the problem, please post your results.

Restart your computer and you should be good to go!

I deleted all data from Flash Player, set the radio button to 'ask' and restarted iMessage. FINALLY. It worked. Thank you all for posting in here. I am so glad to not have to login 4 times in a row. 🙂

Wow, not sure how you figured that one out, but it worked perfectly. I didn't block everything, just did ask. Thanks! 😉

Thanks, Guido, but do I really want to lose that data?

None of this is working for me. Tried all fixes in this thread and no luck.

Any ideas?

Disable iCloud.

Repair permissions.

(Clear caches).

Restart system.

Enable iCloud.

Can you please provide more steps on how to do this?

1. Disable iCloud.

Go to System preferences > iCloud.

Disable all features in the right, and sign out your account.

2. Repair permissions.

Launch Disk Utility, choose bootable partition, and switch to First Aid section.

Run Repair Permissions on that volume.

3. (Clear caches).

It is not necessary but I think it would be useful.

You'll be able to do this by using one of the common maintainance applications, like CleanMyMac.

You can also do this using Terminal, but I'm very goot at it.

But you can google of cause, how to clear user/system cahes on mac.

4. Restart system.

You'll do it without my help)

5. Enable iCloud.

Do exactly what you did in the beginning but in reverce orger.

Login to Messages.

I can't guarantee it will work. But in my case (I don't have Flash installed) it has helped.

Good luck!

Thanks for that. Still no luck tho.

What system are you on?

Mavericks.

Hm... I think, your case is something new.

Wait couple of days. I think decision will come.

Or try to experiment yourself.

By the way, do you use flash plug-in?

If Yes, try to get rid of it.

I don't use that plug-in, and feel pretty comfortable.

Yes, I updated flash player last night.

How do I delete flash?

Thanks for your help!

http://helpx.adobe.com/flash-player/kb/uninstall-flash-player-mac-os.html