Messages App not sending messages to iPhone or other Apple ID Contacts...
It worked fine before, but I ave been having difficulty the last couple of days. Some of them work on my iMac and others work on my MacBook Pro. Do you guys know what is causing this and how to fix it?
MacBook Pro, OS X Yosemite (10.10.2), Early 2011 MacBook Pro 15 Inch 2Ghz