Event issue

[Christian Lut]

Hi all,

I have some problems with the events. The paricipant's receive their 
mail but only the "Update the participant's status" button appears. If i 
had an "Invitation to", he's continue loading. At the bottom of the mail 
there's a message: "In case your email client doesn't support iTip 
requests you can use the following link to either accept or decline this 
invitation:"

All is in the webinterface, tested with different browsers and different OS

Thanks Chris