Why we cannot switch to HA node from GUI on Data Domain new OS

I am using DD900 with os version : 8.3.0.10-1154799. we configured HA on that and is working without issue . Due login to the master node at  the top of page is showing both nodes (Node0 , Node1) but cannot switch to other node (Node 1) and just change the color of top page from blue to gray . Although we can switch to other node from top of page on os version : 7.7.2.10-1011249.  What is the issue ? Does it relate to bug on new version or others ?