Can send iMessages but cannot receive them
I'm using iMessages on my iMac and my iPad. On my iPad, I can send and receive messages fine. On my iMac, however, something strange happens. If I open a new conversation, I send send messages to people and they will receive them, however, if they send a message back to me, not only will my iMac not receive it, but any message I try to send afterwards will be stuck in the "sending" phase with the blue loading bar at the top and it will never, ever complete and I have to just quit the application. I've tried restarting, updating, deleting iMessages related stuff out of my keychain, logging out and back in, changing password, etc to no avail. Also another issue is that nobody can FaceTime me. Help?