Because Switchable Graphics systems use highly customized driver,, I would recommend you contact Dell regarding the issues you are seeing. Dell is in the best position to comment on the drivers they provide for your system.
FYI, I have the exact same problem with my Sony Vaio Z. It has switchable graphics: NVIDIA vs Intel.
The NVIDIA control panel maintains all of the customized settings that I adjust, no matter how many times I switch back and forth between cards. But the Intel control panel forgets the color enhancement settings that I change. Other settings, like power, edge enhancement, noise reduction, etc, keep their set changes, but for some reason, whenever I change graphics cards, my color enhancement settings revert to weird defaults.
I have no idea how to resolve this. So far, Intel and Sony have been no help at all.