You can enable logging by going to WebDrive --> Preferences --> Logging and choosing the level of logging you would prefer.

You can then choose "View Logfile" in this same location in order to see the log. If you choose to "Reveal" in Finder, you will see that there are two different logs: One log file that is named Webdrive.log and one log file that is named according to the name you gave the site profile in WebDrive.

Log files are located in ~/Library/Logs/South River Technologies/