Thanx for the input, all!  

For some reason Windows will no longer load the monitor profiles I generated in PSP, giving an 'incorrect paramater' error when i try to reload them.  Recreating them didn't help either so I used the Windows monitor calibration utility.  All looks good now image-wise, although the calibration chart from the website shows I can't distinguish black levels lower than 6, but my renders look like they should...

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