Black & White Layer in CS5

Has anyone had this problem, is there a fix?
When creating a monochrome image if I flatten the image and then add Black and White as a layer to the flattened image it will not allow me to make changes. Every time I move a slider in the B&W tool it jumps back to the initial position. If I don't flatten before adding the Black & White layer it works OK.
The only way I can make it work if I want to flatten the image beforehand is to select all layers and then Merge Down, Merge Visible causes the same problem as flattening.
Worked OK in CS3.
Derek
Win 7 32 bit,CS5, 4Gb Ram.

I only get the problem if a colour image with layers
is flattened before the B&W layer is added.
This will work if the B&W layer is put at the top of the stack.
Like this it does not work
The original image is:
I shrunk the image down to 96 P/I and 12 cm wide so I could post it here and found that I don't get a problem with the B&W layer at all.
So I flattened the full size image, saved it, closed the image and then reopened the flattened image and then applied a B&W layer and again no problem.
So I suspect that it is a memory issue or some other sort of conflict.
I have 4Gb of which 1.2Gb is available for PS.
I installed Win 7 as an upgrade from Vista.
I have seen on other PS problems in the forum that a clean install of Windows can cure some problems.
Thanks for your response.
Derek

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http://i57.tinypic.com/16ifm8n.png
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http://s814.photobucket.com/albums/zz63/mtrzepla/?action=view&current=H264BlackLevels.jpg
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