Track Lock (Trouble)

Ok guys, good morning.
Yesterday, I finished a session in Nuendo. Everything ok.
But today, when i opened the session again, I have some tracks locked without my command, if i click unlock, nothing happens.
Locked forever?
Someone can help me?

:astonished: :astonished: :astonished:

Nuendo 7 (Trial) + Nek 7
N.I. Battery (Just this tracks are locked)
N.I.Kontakt 5.5

Mac OSX 10.10.4
16 GB RAM
2 TB HD