I have trouble running your app in Safe Mode. In particular, it seems as if some scripts are trying to read /tmp (phpgroupware/phpgwapi/inc/class.sessions_php4.inc.php) when trying to read the session variables. Then I saw it again trying to read / in the scripts phpgroupware/phpgwapi/inc/functions.inc.php and phpgroupware/phpgwapi/inc/footer.inc.php, although I am not sure what this was connected to.
Would I have to use mysql sessions to view current logins if safe mode is turned on? And with the later problem, could this be from incorrect configuration or is this a limitation of the current project?