xrdp is creating its 'sessman.log' logfile in /usr/lib64/xrdp/ by default. Although directory /var/log/xrdp/ with empty 'sesman.log' and 'xrdp.log' files exists but xdrp does not log there. Expected behaviour is that xrdp will log into files in /var/log/xrdp/ instead of /usr/lib64/xrdp/sessman.log. Default configuration option LogFile in /etc/xrdp/sesman.ini should be changed.
The package has been removed from portage.