php CalDAV implementation doesn't work on IPhone. debugging needed - repost

Avg Bid (USD)
Project Budget (USD)
$250 - $750

Project Description:
We have CalDAV server written on PHP using sabredav library and it works just fine everywhere. Apart from small bug on IPhone. Whenever someone is invited to meeting they can see that meeting on Calendar but Accept/Maybe/Decline buttons are not visible. We can't understand why. We have another opensource CalDAV implementation where it just works.

Skills required:
iPhone, PHP
About the employer:
Public Clarification Board
Bids are hidden by the project creator. Log in as the employer to view bids or to bid on this project.
You will not be able to bid on this project if you are not qualified in one of the job categories. To see your qualifications click here.

$ 472
in 6 days
$ 1545
in 15 days
$ 630
in 30 days
$ 1545
in 20 days
Hire hireafreeelancer
$ 927
in 25 days
$ 618
in 10 days
$ 825
in 15 days
Hire codehard
$ 719
in 25 days
Hire Trentsetters
$ 880
in 20 days
Hire ifcodes
$ 1545
in 22 days