Imported RAW files convert to black and white

I have LightRoom 1.4.1 as well as LightRoom beta installed.
Intel iMac 20, OS 10.5.2
Camera is Canon 40D.
I imported images from a Compact Flash card into LightRoom beta. They downloaded as they should, but then without my touching mouse or keyboard they, in random order, changed from color images to black and white. I deleted them all, exited the beta, imported the same images into LightRoom 1.4.1. Same thing happened.
I tried the Convert to DNG option, and they all imported as black and white without a preliminary color mode.
There are no develop steps set in the import dialog.
I imported them using the Canon import program, and they remained color images as they should. However, if I located them with the finder, though Preview showed them in color, Open With Lightroom or Photoshop CS3 brought them up as black and white.
I'm stumped.
There were several jpeg files on the same CF; they imported and behaved as they should.
Arthur

So I downloaded all the upgrades and re-installed them; rebooted, murmured incantations, re-imported photos.
Same results--black and white photos, rendering the computer and my software useless for processing.
Then I disconnected the card reader from my powered external USB hub, and plugged it directly into the iMac. All problems disappeared. Everything works as it should. Took a while to figure out, but my problem is solved.
Arthur

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