I am happy to share a workaround with everyone that I just came up with. I don't know if I want to go as far as calling it a solution, but it works for me until Apple figures what is actually causing the issue.
In a nutshell, for whatever reason, no ColorSync profile is embedded in the Master images associated with Aperture libraries. I know for a fact my 7D shots were embedded with the Adobe RGB (1998) profile and displayed correctly within Aperture on my iMac running Snow Leopard. The issue occurred when I exported my Project as Library and viewed it on my MacBook Air running Lion.
Here is an example of the lack of an embedded profile in my Master image:
Below the space: RGB line should be a profile tag. Notice that it's missing?
Here is my solution/workaround:
1) Close out Aperture and get to your Master images by right-clicking on your Aperture library and revealing package contents:
2) Now, navigate to /Library/Scripts/ColorSync and locate the Embed script.
3) You can individually embed ColorSync profiles to images or do a batch change like this:
4) When prompted, select the ColorSync profile to embed into each Master image. In my case, I chose Adobe RGB (1998). For multiple images, this Embed script may take a few minutes to finish.
5) When using the Show Info script, you'll notice that your Master image now has the correct ColorSync profile embedded:
6) Finally, reopen Aperture and notice that those dull images are now their original vibrant selves! No more color shift from the preview images to loaded images!
BEFORE
AFTER