The log should not be empty even if no error is happening it will still log things, so if you see nothing at all in the log it indicates file system permission problems, the /Data and /App_Data folders need to be writable by the user that is the identity on the application pool or lots of problems can happen.  It means it cannot write to the log. I recommend fix the file system permissions first then if other errors are happening they will be logged and it may help solve the problems.