My files are suddenly going dark after certain operations?

Last week a very strange (and new) thing began to happen. If I have multiple files open in tabbed viewing and I perform certain operations on any one of the open files, all of the open files suddenly darken considerably. It looks as though I had created a new top layer, filled it with black and then adjusted the opacity slider for that layer to around 40 or 45%. As I said, that immediately happens to all open files.
Many different operations have made this occur, but the 2 that will do it every time are either converting to a new color profile for one of the files or dragging one of the files down out of the tabbed linep so that I can grab a layer from that file and copy it to another file. In that case the darkening occurs as soon as I drag the file down from the tabbed lineup -- not when I copy the layer.
Here is where it gets interesting. If I save these new (appearing much too dark) files and close and then reopen Photoshop and then reopen those files which a moment ago had looked much too dark, they look fine. And they continue to look fine until I do something which again causes every open file to appear as if a 45% black layer had been droped on top of it. There has not been a Photoshop session in the past week where I did not do something (though I have not loggged all of the things which will make this happen) to bring about this problem. If all I'm doing is resizing or copying layers, it's not much of an issue because I now know that the files which look way too dark will be fine the next time I restart Photoshop, but it's changed my workflow since I now need to think ahead and try to finish all of my color critical work before doing anything I think MIGHT cause the problem to occur.
Has anyone ever heard of anything like this before?
I'm using Photoshop CS4 Extended on a Dell Workstation running XP Professional (32 bit) and consider myself to be above average -- though by no means an expert -- in terms of Photoshop literacy.
Thanks in advance for any help.

This is a REAL longshot, but it sounds as though maybe an OpenGL shader to do gamma conversion isn't working. I say this because the symptom sounds quite similar to something I saw when I was implementing my own shaders in my software.
Since OpenGL is implemented on your GPU hardware by your video driver, is your video driver up to date from the web site of the maker of the video card?
-Noel

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