Desktop suddenly darkens and menu bar and desktop icons disappear

Hi guys,
Some times (not very often) suddenly the desktop darkens, and the menu bar and the disktop icons disappear, while the dock remains. I have to click in order to return!
What causes this thing?
P.S. Before awhile, that this happened again, I looked at the console and saw these two events:
1)**** [IOBluetoothHostControllerUSBTransport][SuspendDevice] -- Suspend -- suspendDeviceCallResult = 0x0000 (kIOReturnSuccess) -- 0x3000 ****
2)setPresentationOptions called with NSApplicationPresentationFullScreen when there is no visible fullscreen window; this call will be ignored.
But I cannot specify the exact time it happened, in order to see if any of those two messages are related.

Thank you Niel!! Re the problem with the display being too big to fit the screen. I had exactly the same problem as geraintfromswansea and was completely stymied. Never even thought of Universal Access being at fault. Must have hit the keyboard command somehow to turn on magnification. Fixed now thanks to you.
Rod

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Desktop suddenly darkens and menu bar and desktop icons disappear

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