but for the story, before inatialising my computer, i was using some plugging like Neat video and there was this green or pink or white flash screen, i wrote to Neat video and they answered that many of their customers had the same problem and that the problem was comming from FCP X itself and since particulaly the 10.0.7 update.
The FCPX 10.0.7 problem is caused by FCPX itself: it is a bug
(programmer error) in FCPX itself. Therefore, it is Apple who
can and must fix that bug in FCPX.
We all (both developers and users) are now waiting for Apple to
update FCPX and fix that bug of FCPX 10.0.7.
Many people using very different plug-ins (not only Neat Video)
are affected by that bug in FCPX. Some examples:
Even here: (!!!)