The MOST important thing needed with ALL PC bug reports is the Output Log.
Copy the form at the bottom of the instructions page and then hit the Add New Report button on the right.
Please read the instructions HERE before creating a new report.
By default, output log files are in:
Windows - %AppData%\7DaysToDie\logs
Linux - <game folder>/7DaysToDie_Data/
Mac - Next to the game's .app file
Please report bugs to the Bug Pool, not in the General Support forum.
Edit: Link to the bug pool has been moved to inside the instructions so folks hopefully follow them