XSplit Broadcaster has options to perform comprehensive logging used for searching errors and troubleshooting.
Enabling Enhanced Logging for XSplit Broadcaster
Go to Tools > Settings.
Click on the Advanced tab and check Enable enhanced logging.
Recreate the issue you have been encountering then close XSplit Broadcaster after.
You can find the entire log folder through the link on the Enable enhanced logging hint.
The Log folder can be found in C:\ProgramData\SplitMediaLabs\XSplit\logs\XBC by default.
When sending the log files to the support staff, we recommend compressing the whole log folder into a .ZIP file and uploading it to a file-sharing service such as Google Drive or Dropbox.