Group Icon Missing

After updating my elgg setup from 1.8.13 to 1.8.14, i am observing that the groups icon are missing. Old group or newly created group, No icon or group picture is being displayed.
Here is an demo account for you so that you can login and see the problem..
User: demo
Password: campusdemo

Also i am observing that once login then again after few seconds i am being asked to login again saying the session has expired. I am using the plugin "login required" is it because of that.???

Kindly help me with both the problems. Thanks in advance.