Display Memory indicates actual memory IN USE at that time, while Dedicated Memory is 3034MB (your 3GB). Shared Memory is another term altogether and I THINK it's a modern term for what used to be called the AGP Aperture - basically the amount of system RAM it dedicates for graphics based caching to feed your GPU.
Glad you got this sorted though
Warning though: the latest Nvidia drivers have a bug on 560Ms and S3 states (hibernation). So if you use hibernation the display might not come out of standby. This is why our website still has 267 drivers on it.