Today MAXON released SP2 for Cinema 4D R18. For details on bugfixes and changes see the announcement on our homepage.
In parallel we updated the SDK documentations for C++ and Python. Not only did we correct things and integrated changes relevant for the new version, but under Overviews you will find new manual sections on Threading and GUI and User Interaction. Please note, the old information on User Interface was left in there unchanged. This will probably be the case for another one or two releases, so we have some time to gather your feedback.