Problem: We can't Disable all Order/"Sort by" options - Save isnt working

[lipes]

I am trying to disable the Sorting order by  http://localhost/Teste2/administrator/index.php?option=com_virtuemart&view=config
In the 6th Tab - where I only have 2 options enabled (manufacturer name; Product Price)

I removed the 2 checked box and Cliked to SAVE ... but it's not working!
I also tryend to disable that 2 options and click SAVE & Close .. but also not working.....