I had a similar problem with Lexar cards and my 20D. Then I noticed that there was no USB symbol on one of the cards (the ones with the USB symbol downloaded fine with the Lexar cardreader). I bought a different card reader (a Hama) and there was no problem reading the cards. I have since purchased a Sandisk card reader, which also works. Looks like the problem is in the Lexar card reader.
cheers,
jim
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