Messages app won't sync on one computer

Dear Community,
I'm having problems with the Messages App on one of my 2 Business Computers. I do use a Mac Pro at work as well as one in my home office. Both are similar, running the latest version of Mavericks and do have the Messages App configured the same way.
However while iMessages from my iPhone or iPad do sync correctly with the home office Mac, the other one simply just won't sync anything! Nothing comes in and nothing goes out... altough when I try to send an iMessage from that computer, everything seem ok, but after 5 minutes the message ist listed with a red ! symbol which says "Your message could not be sent, Try again".
Anyone any idea?
Of course internet and iCloud is working perfectly on both computers.
Thanks for help!

I am having the same problem.  iMessages sends and sync with my iphone 4s and ipad, but even though I'm signed in on my mac with iMessage, I can't send any mesages and they don't sync with the messages sent from my iphone.   I am signed in with my AppleID on the mac, and I get the confirmation notices on my iphone and ipad, but I can't send send or receive iMessages on the mac.
I've tried the numerous fixes suggested in other articles, such as signing in and out on all my devices (starting with the iphone first), deleting plist files, uninstalling Flash player, resetting the PRAM, repairing disk permissions, booting in safe mode, but nothing works. 
I have a MacBook Pro 17" running the latest version of Mavericks with Messages version 8 (4226). 
My iCloud account is a different login than my AppleID I use for the iPhone, iTunes, and Messages, but that's because it's the AppleID that is tied to my cell phone number. 
Thank you for the help. 

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