I figured out the issue, it is documented below for any future users with this issue.
Maxon introduced a plugin caching system at some undisclosed point in time and didn't bother to tell anyone.It doesn't work reliably and may, or may not, prevent you from being able to use new plugins on a MAC.
On MAC's, R15 or greater, you now HAVE to place plugins in the user plugin folder, not the app plugin folder. (Although it seems completely random as to wether , app/plugin folder will or will not work).
For the c4d/plugins folder, the first time you install and launch C4D , a direcory cache is created ! Thereafter , anything you place in the c4d/plugins folder, may or my not,be completely ignored by C4D.
So, from now on, you HAVE to install your plugins into the user/plugins folder or they may not show up at all.
Q : How do I find out where the user/plugins folder is?
A:
Open C4D.
Navigate to your main C4D preferences.
At the bottom of the preferences, there is a folder/path and a button to open this path in your finder. That is your user/folder.
If there is not already a "plugins" folder in there, just create one and extract your new plugin to it.
TIP : on a MAC, try using a third party tool to unpack the file, such as Stuffit expander. Some users report that the system expander can cause problems, with Mavericks.
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