Glad you got them back - sorry that Gdad didn't.
I've had a couple funky things happen with memory card readers. For a while, I was using a cheapie clear blue one that I got for a few bucks from one of the Chinese retailers (probably Meritline) and it works fantastically; in fact I actually have 2-3 or them. (One stays in my wife's Fuji PnS bag so she can use it at her job, etc.)
Meritline had deals on a couple other ones since then that do multiple types of cards, so I've got 2-3 of those that have been different designs... and they're all been a bit funky. They'll see the card, but after starting to move data, they'll barf and say that they can't access the card. I'll eject and reinsert, and things will be OK. I would have to copy and then delete everything to avoid errors, and even that was dicey. For a while, I thought there might be something with my PC, but when I started using the old reader again, things were fine.
I since replaced my old internal reader (which couldn't do SDHC) with a new one, and that one works great, but I used the old blue one on our last trip nightly and it still works perfectly.
That was a bit rambling but the point is, be aware that the card reader itself can be a bit funky, and when in doubt, try another one.
I think that
this is the one that I've got, but the color is slightly different... but the design is the same. And on sale for $1.49. It's hard to beat that. (The ones that didn't work were actually under a buck when I bought 'em, so it's probably worth digging deep and spending the extra dollar or so.

)