OK, some notes-
1) cinema cameras are not supported. They mess stuff up. Delete them.
2) Can't change the names of the C4D file or the KS file after the live link has been initiated with the "Render" button in the plugin. Changing either breaks the link.
3) Simple moves are fine, rotating, translation, scaling
4) Adding objects works great
5) Deleting Objects doesn't work unless something else in the geometry is changed. Just deleting something doesn't remove it from the KS project, but if you delete something AND move another object or add another object, it updates and removes the deleted object. And sometimes this doesn't even work. And once the sync is lost between the files, can't get it back. Think it is broken if the names of the objects are changed.
6) Applying materials in C4D is only reflected in KS if either ALL objects in C4D are selected in the object tree or NONE are selected. if some objects are selected, but others aren't, only the materials of the objects that are selected are updated.
7) All geometry has to have unique names, even if buried in the object tree under other null objects. If there are objects with the same name, material reassignment occurrs.

Changing the hierarchy of the object tree in C4D breaks the link. If there are 2 spheres in the scene, render to keyshot. go back to C4D and group under a Null object, hit update, and the spheres are duplicated. Now there are 4 spheres in the KS doc, and 2 in a null in the C4D file. From there on out, there is no way to get them back in sync.
Not a lot of solutions in these notes above, but some realizations that the plugin is a bit more limited than I'd expected. But, now that I'm aware of some of the limitations, I can try to work around that. Like making sure my model is as far as I can get it before I send it to KS, as I know if I make any major changes to the geometry, object tree, naming, etc, it will most likely break the live link.
I hope this all makes sense, I can make some screen captures demonstrating some of this stuff . I'm pretty sure I'm on the latest versions of the KS and the plugin. and using Cinema4D R18. If there is anything I can follow up on to help I'd love to be a part of it. C4D to keyshot will be my workflow from here on out at my new gig, so I'm willing to put any effort into making the process easier!
Cheers!
Matt