Hi,
I am not sure if it is only me or my laptop. I noticed for the last few beta releases to the last RC, I have the same problem; unable to empty Trash when there is a old copy of L4 in the Trash after an update exercise.
Can some one help to confirm, if it is the case.
Yes I have done all the disk and permission repairs using Diskworrier, before I try to do the normal trash, even tried secure trashing.
I use TrashIt (Free Apps) to trash the discarded L4 copy from the trash.