Thanks for the quick reply. A Lexar 4x, 1 Gb. It has worked flawlessly in my 300D for about 3 months or so.
I will be updating firmware tonight. I understand this is one of the "fixes" that Canon has worked on.
I took a little over 220+ shots on the card and all others are right on. I did notice that it took quite a while to come up in ACDsee.
Just my luck to get a finicky new camera. !!