File Upload Action Button are not working

Hi  ,

In the File Upload Process when the processor are open change request there are Action Buttons  Approve/Reject ,

When the CR Processor are Click on either Approve or Reject  these two Action Button are not working (means its not show any activity) , while rest of all action button like save,close check , Run validation  are working ...

While Processor has authorization to Approve/Reject that CR ...