Hello,
I can see how this can be very frustrating. Does this happen for every scene?
I will try to look into Corona v6 for R18 if I get the same behavior, and we'll work from that.
If this happens only for a particular scene, would it be possible to send the scene over?
https://corona-renderer.com/uploadIf you happen to see the stop happen, please, make sure you have saved your scene and press Left Shift, Right Shift and Delete (This will force quit C4D and create a log file), go to %appdata%/Maxon/ and inside Maxon Cinema 4D R18, open _bugreports and send us _BugReport.txt. This may help a lot with our investigation.
Thanks,
Jan