** it returns to the login menu and so forth. **
Has it ever worked or is this a new installation?
There are two possibilities that come to mind:
1. The script can not write to the sessions directory... for whatever reason.
2. Your browser is not accepting cookies.
** 4. Server Log: **
CalendarScript is not PHP and does not access MySQL so those error messages have nothing to do with it.
JMO
Dan O.
------------------