The issue as introduced with the NVIDIA 39x.xx drivers and - depending on the timing of your machine - the issue can happen in R20, R19, R18, ... .
If you're running into this issue, then besides reverting to a not crashing driver is disabling the threaded viewport redraw to work around this driver (crash) bug:
To enable the workaround a command line parameter needs to be set for Cinema: g_threadedRedraw=false
It will - as the name implies - disable the threaded redraw in the viewport (which is triggering the NVIDIA driver crash). This parameter can either be set via the Windows command console or - easier - by creating a program shortcut and adding the parameter to the target field.
These are the steps to create the program shortcut:
1. Select the CINEMA 4D.exe in the Explorer and press the right mouse button.
2. Create a shortcut for the program.
3. Open the properties of the shortcut.
4. The first editable field of the shortcut contains a line called "Target" which contains the program path and name enclosed in quotation marks. Add one space behind the last quotation mark and add g_threadedRedraw=false (without any quotation marks) at the end of this line.
The resulting "Target" line might (depending on the install path) be something like: "C:\Program Files\MAXON\R17\CINEMA 4D.exe" g_threadedRedraw=false
5. Confirm your changes with "OK".
Regarding how MAXON tracks bugs: It happens (of course) in a database and the crash reporter (that 's popping up in case of a crash) is used to submit them - in case you submitted a valid email address, support or development will use this to get in touch with you.