Try this. Not sure if it would work but you can try. Scriesm said that it's the hbmenu build that's need to be fixed in order to work on 5.1 everything else is working like it should. You could try downloading the checkpoint app for save backup and restore then rename and replace the checkpoint.nro with the hbmenu.nro (not sure if thats the exact name, recheck the original) and put it on the root of the sd card. If it worked. While on the switch menu when pressing album it should take you to checkpoint instead of the hbmenu. Not sure if works but I think it is your only option atm. Good luck.
Tested and not working.