Most of the time I find that the only way I can lock a bd file vault is by locking in intermediate view because right clicking fails and expert view fails with error reporting that files are open when they are not.
Occasionally (very!) everything works fine.
I see that this lock problem has been a recurring theme over several years but I've always been happy to use Cypherix Cryptainer. However BD support has told me to turn Cypherix off to solve some other BD bug so now I need help.