BIG problems, data loss

I have just lost my korganizer data, with all appointments in it. the
standard.ics I see is from 23rd may..... I am _sure_ I saved it
between 23 may and now......
When trying to add an appointment in korganizer, it complains: "No
resource available".

Any idea? 

If this is a problem with the software, let me tell you I am really annoyed :((


Raph