[Robert Klopcic]

Well, I cant downgrade to Yosemite, Option key or CMD+R wont recognize my USB stick with Yosemite from my own Apple ID store. I made with terminal and or Disc Maker … But this is another story.

So I made fresh install of ElCaptain, install FCP 7.0.3 again and try it.
So far, so good. So I believe there was some system errors. I hope.

[Robert Klopcic]

On Yosemite FCP works fine. I am not using Compressor, Motion or QMaster at all.
About converted files: I am using Wondershare HD converter and all clips I made with Nikon D800, I convert with this SW to factory preset settings for FCP (Prores 422 codec). It took some time to convert, but it worth and necessary for Nikon recording clips.
Than my timeline in FCP run smooth, no need to render those clips every time I made some changes (cut, move, crop …)

Today I will put my “Yose” back to system and let you know if there is everything again.

[Robert Klopcic]

Thanks for answer! At the moment I am backing up my baby iMac, and tomorrow will downgrade to Yosemite.
I just dont like to install all S/W again, but …
Thanks again, I just hope my FCP will run smoothly again.

It is raining outside, but I will go out, far away from computer …
I was born in 70′. Happy days. No RAM, No Disks, No iPhones…