Same problem on my FA 2.5.3 installation on Xampp 1.8.0, Windows Server 2003.
Internet Explorer gave some clue:
Fatal error: Maximum execution time of 60 seconds exceeded in C:\xampp\htdocs\akunting\includes\session.inc on line 28
Below are lines 27 and 28 of session.inc:
// Make sure the session hasn't expired, and destroy it if it has
if ($this->validateSession()) I have experimented changing the max_execution_time from 60 to 120 and even 600, but it didn't help. The error persists.