Blank histogram, how comes?

Since today, when I select a thumbnail in the Library, the histogram is blank. The frame is there at the top right, but contains nothing.
When I select a thumbnail a word flashes very briefly inside the histogram frame(I believe "Calculating..."), but then it remains blank. Exposure and focal length information at the bottom are updated, and so the keywords and other stuff in the right panel. Did I break something?
System runs Windows XP.
Thank you for any help.

I believe I figured it out: affected files where all off-line (imported from DVD without being copied to HD).

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Blank histogram, how comes?

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