And to make matters still MORE confusing, I'm also running Lightroom 4.4 on a second computer - a MacBook Pro. This doesn't have any "Adobe" folder inside the "Applications Support" folder - none, nada, zilch. Nothing similar under my "user" profile there. And when I do a search, the computer can't find any of the DCP files ANYWHERE on the hard disk. And yet when I run Lightroom, it still finds the Nikon color profiles, both Adobe Standard and all of the custom Nikon ones. And nothing but "embedded" for the Ricoh shots. I have no idea where this copy of Lightroom is finding ANY of this stuff, but its finding the same profiles and NOT finding the same profiles as the version on my desktop machine.
Ray, is ACR is installed on your 2nd computer? I think ACR creates the Adobe folder under "Applications Support".
Try this, with finder window browse to MAC HD/Applications/, right click or ctrl+click on "Adobe Photoshop Lightroom 4", select "Show Package Contents"
From here, you should be able to browse to "/Contents/Resources/CameraProfiles/Adobe Standard/" and see a list of .dcp files including the coolpix A that is installed by default with LR 4.4.
Unless there is some specific program or security settings, it's weird that it didn't create a "CameraProfiles" folder under your [users] folder, but I think this will work,
Shutdown Lightroom, go ahead and create a "CameraProfiles" folder under MAC HD/Users/[Username]/Library/Application Support/CameraRaw/CameraProfiles/" and copy the ACR 8.1 Ricoh GR folder under there. Start Lightroom again and it should see it.
I managed to get access to a Mac system and just installed LR 4.4 and can verify the above works.
Update: Apparently, I don't think I can install ACR 8.1 beta without having photoshop/photoshop elements installed. It gives me an error saying the patch is not applicable. If I try to install ACR 7.4, it only installs the DNG Converter.
Also, I tried to install the Ricoh GR profile under "MAC HD/Applications/Contents/Resources/CameraProfiles/Adobe Standard/" location and LR did not detect the profile, meaning only "embedded" was available.