Hi James - thanks for your answer.
I indeed uninstalled M4 and reverted to M2 with the same problems.
Furthermore, when I first move a window to the "forgotten" desktop, the D3000 seems to crash (the screen turns a random color or freezes) and Windows 8.1 tells me that the "last USB device connected was not recognized". I hear the USB disconnect sounds. My ethernet, mouse, keyboard all work fine, but the monitor is blank.
I went to Dell's site and I (painfully) installed all the latest driver files I could find, but none of this solves anything. I am starting to wonder if it's a hardware (D3000) problem. The time I have spent on this problem is surely worth the $ of a new port replicator.
Any other ideas?
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