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That is odd.
I don't really know but here are two silly things to try.
1st make sure any open apps are closed as sometimes, programs with similar hotkeys tend to take preference over other programs.
I don't think this is it since you say it only happens when you click on a layer that has luminosity selected.
Another thing which is silly as well but worth a shot s to save the file as a layered tiff, close everything, reopen photoshop and open the tiff.
Maybe that psd file is corrupt in some way.
Also, you don't have a non us setting on your keyboard do ya?
I think I heard somewhere the qwerty mac keyboards can be glitchy if not set to us settings.
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