Camera Raw Won't Open B&W Image

I scanned both color negative and b&w negatives to tif files with my Scan Elite 5400 II, using latest Vuescan software.
I can't open the b&w image in CR but I can open the color ones.
I'm baffled, can CR discriminate between color and b&w images? I've tried scanning the b&w several times, using Vuescan b&w settings and also with color negative settings, and the color images open fine. Is there some tag that is attached to a b&w tif file or can CR determine if there is color in the file?
Has anyone had a similar experience or any ideas about why this might be happening?
Greg

> Is there some tag that is attached to a b&w tif file or can CR determine if there is color in the file?
In a sense, yes. That is, if you asked Vuescan to scan to grayscale, then the resulting TIF will have only one channel (instead of 3, R-G-B). I suppose ACR wants all 3 channels, so I'd advise next time you Vuescan to grayscale, you instead scan to RGB (even if it's a monochrome) ... or, convert the grayscale TIFs to RGB before ACR.
[Edit: I wonder what would happen if you imported these grayscales into Lightroom, and then asked to 'Develop'(?) That is, are grayscale images campatible with Lr?]
HTH :)

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