I have Mavericks 10.9.5, and my Mail program has worked fine until this past week. Fine means that I can open a new email to send and then go to another archive email for test , copy it and then paste it in the new email, etc all while my other programs like Safari are still open. However, now, when I open a new email to send, my second monitor goes grey ( where Excel and Safari are open) , all icons below and above on monitor 1 ( MAcBook Pro) disappear and only the new email that I am creating is active.
The only changes I can tell are that I had a system upgrade last week that may have changed some setting.
MacBook Pro with Retina display, OS X Mavericks (10.9.5), 27" Cinema display
