Xstore Application Hangs as soon as login with user id and password

Dear All ,

Had test machine which was working fine till yesterday .

Today when i tried to login with the existing user and password(  in the xstore application to test sale transactions .

Its hangs there at password screen  it self . not at all moving . Had restarted the machine many time s.

When i dont try to login and touch other screen menu buttons its working , as soon as login its  hangs  Tried with user id and passwords  which are valid to this machine

And no writing is happening in xstore.log to identify whats the issue .

After some time its getting to again register login , as store is already open in with old date