Hello
This only happens with certain users and not with others.
I would first check the GUI version of those users with the GUI version of the user who is not facing this issue.
Secondly check the prerequisites mentioned at the bottom of this page
http://help.sap.com/saphelp_nw70ehp3/helpdata/en/e7/dab3913e804de4a6aa7e5b31e1aa1c/content.htm
Regards
RB