The best method for reporting a bug is to use the Bug Forums on Steam .
IMPORTANT: Prior to submitting a bug report, please ensure you have read the stickied thread on bug reporting , as well as searched the existing topics on the forum to see if the bug in question has already been reported.
You may also want to check the Known Bugs documented here in the Wiki, as there may be a workaround for the particular issue you are having.
You may be asked to provide a Save File to assist in troubleshooting the bug. The location for save files on your platform can be found here: Save File Location .