How do get the text in Messages to display while I’m typing? At one time my Messages app showed text and the text field where I would type my messages but suddenly it has disappeared. How do I correct this? I've tried changing the contrast and the display settings and nothing has helped. Also it is hard to see fields where I might enter names or info. In other windows as I use the computer (although the problem has just recently occurred I did change the monitor recently as well).
Try to reset to the defaults the colors in System Preferences -> General -> Color Scheme, also the highlight color above. I had troubles myself with this settings before.