I had a client of mine who is on our help desk contract call in with one of the weirdest problems I have ever heard in my 12 years of computer work. If you have insight into this one, you deserve 500 points.
Problem: Application window becomes transparent when trying to enter text via keyboard.
What is going on: This is a RANDOM phenomenon, doesn't happen every time. Has no apparent reason when it happens.
User opens any application in Windows 7 Professional computer (any application such as Excel, AutoDesk, etc.). When they click in a text field with the mouse and begin going to the keyboard to input text, as soon as their hands hover above the keyboard the application window becomes transparent (you can only see the outline of the window). They cannot do anything except take the mouse and click back on the application a couple of times to apparently "awaken" the application. It may take two or three times to awaken it. Then they can type in text.
They do not touch the keyboard or move any wires. It happens as soon as their hands get near the keyboard.
I have no idea why this would happen. I've suggested an exorcism on the machine. :)
Any thoughts would be appreciated b/c I have nothing on this case.