Fix your image attachment features because they are BROKE.
Your broken program just cost me feedback at work. Having to wait till all your images are loaded before you can hit enter and send them has again cost me time at work. You should be able to hit enter to send images and just have them send when they are done loading instead of having to wait. Also having to rename images that are named the same IN YOUR MESSENGER is counter productive and annoying. Be more like skype and less broken.