can't delete audio please help

Hi,
since 8.2 i can’t delete any files to trash from Pool window.
is there something changed or buged ? really need to clean that and that’s the only way to do it with multiple files at once.
it says :
“the selection is in use and cannot be moved to trash because it is used in another pool!”
… it’s not and i never had this message before.

https://www.steinberg.net/forums/viewtopic.php?f=275&t=138575

thx couldn’t find that last post :’)