A few days ago, Py4D had some problems with the internal license management of CINEMA 4D. So if the serial of a plugin expired once, the plugin will not work anymore (just with a small workaround). Some people were in luck by requesting a serial before Py4D expired. I am sorry for this – thanks for your patience…

I fixed the problem with the license management.So if you start Py4D again you need a new serial. The activation code is equal the first eleven digits of your CINEMA 4D serial. Just pass this activation code to the serial generator. By the way Py4D returns with a lot of bugfixes, changes and additions. I took the time to fix all crashs which were reported and Py4D seems to stable now. Several bugs with Thinking Particles, BaseBitmap, the Texteditor and internal memory management are fixed.

See the ChangeLog: http://www.py4d.com/doc/misc/changelog.html