Kolab 3.3 no accept/deny buttons i email on calendar invitations

[Nikolai Maziashvili]

Hi everyone,
When receiving email about appointment invitation i get 
this nice yellow box where buttons "accept" and "deny" supposed to show 
up, but instead i see two arrows endlessly looping with "loading" 
message right next to it.
I am running Centos7 machine with Kolab 3.3.
Any ideas what this misbehaving can be linked to?
Thanks in advance guys.
Nikolai
 		 	   		  
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