After upgrading to MB 5.18 one of my wallets has an unknown password.  Since there are no "hash" marks or asterisks I am not even sure how many characters there are...  I have restarted 5 times with no improvement, tried all of my passwords, even my 256 bit password, with no good results.  Is there anyway of "deleting" said unknown password?  Or finding whatever it may be?
Any and all help will be tremendously appreciated..