I have some very important pictures on my Lexar JumpDrive. I can
see them on my old iMac but cannot copy them onto a CD. I was
able to on my newer iMac up until I installed OS 10.3.8...now I cannot
see the device on the desktop...flashing green light on the device.
I really need to get to these pictures...any advice?? Thank you.

Have you tried to connect your jumpdrive into a port other than the keyboard? My boyfriend has a Lexar Jumpdrive and if you try to connect it to the keyboard, especially in osx, won't show. Try that!