1) HOLY Crap this website doesen't work with IE9.
2) I have some huge problems with the calendar and couldn't find here any bugtracker.
2.1 If you click on File -> calendar -> (new window open) and cklick on "Help" - the following page is tried to be loaded:
http://projectlibre.comchange_working_time_dialog/
The URL is incorrect and even if you correct it - there is nothing
2.2
I have in my Project created a new Calendar with the following Settings:
Name: Kagome-Work
Monday until Thursday is no working time.