Computer doesn't recognize card reader

I am having trouble downloading images from the SD card used in my Canon S3IS using a LaCie card reader. Tonight I downloaded images from a 1Gb SD card from my Canon SD800IS, the card reader worked perfectly. Then when I tried to download from the 2 Gb SD card from my S3IS I couldn't get the computer to recognize that there was a card plugged in. I have an Emac using OSX 10.3.9. I have been using the Image Browser software that I had installed when I had a Canon S1 IS, it had been working fine, but now I'm not getting any response from the computer. Tonight I installed the software supplied with my S3IS and downloaded the images from the camera, but I still can't get any recognition of the card reader with the 2 Gb card. When I have the 1 Gb card in the reader I get a driver icon in about 2 seconds, but I don't get any response when the 2 Gb card is installed. I had thought that my USB ports weren't tight and didn't get a good connection but the 1 Gb card shows that the problem is elsewhere. Are card readers limited in the size of card you can use with them? I have used this card before even though sometimes I had to plug and unplug the card reader into the computer several times before it worked. I should mention that the power light on the card reader always comes on. The images download just fine from the camera and there doesn't seem to be any problem with the 2 Gb card. Does anybody have any suggestions?
Thanks for your help.
Gordon

Terence:
That's probably what I need to do, get a newer card reader. I thought I had fixed the problem by "reformatting" my cards. I did some test shots and the reader worked fine. Next day I shot about 150 shots (on two cards in two cameras) and the computer didn't recognize either one.
Thanks for the help.
GT

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