Ax 2012 client - role center is not working


I’m new to role center and also for Ax 2012.

We have installed Ax2012 VPC. Till yesterday Rolecenter was working while opening the client and also in EP.

But today in Ax client it is not working in home page but in EP it is fine working. Any setup might be changed. Can any one please advise what could be the reason for this.