But also have problems... But they are of the camera i guess
......
1. Sometimes there are vertical lines and crazy temperature (WB) changing. There it is:

It disappears when I press set button for STOP rolling, and then, when i press REC it appears again.
So there are two ways to avoid it: 1. restart the camera
.....
It happens not only when shooting raw, but I noticed that it took place when the color profile set to cinema style (downloaded from the Technicolor webpage if I remember right)
Thanks for feedback , which crop_rec built are you using ? there 3 different builds I have on my download page by the way .
Similar problem that @ masc had , camera setting issue , Technicolor Cinestyle picture style has nothing to do with it ( I've had installed on my cam since 2012 & do all my tests with it)
It came to the shutter speed , I've
tuned/locked the preset to be
180 degrees 1/48th second @ 23.976 fps , and any other setting mess up liveview
here the fix
https://www.magiclantern.fm/forum/index.php?topic=19336.msg215200#msg215200I see in the video you have 1/38th shutter speed in crop_rec 2.6k & 1/50th in 3x3 (FHD) .
You
Must set the cam to 1/60th (1/64th close enough) 29.97 fps in 3x3 (FHD) when crop_rec enabled it will change to 1/48th 23.976 fps automatically
If you change this you will have problems , as seen in your post.
Think of the 5d2 as a Manual 24p film camera
(there's a long answer , but I don't have the time right now , it has to do with the Headtimers 3 ,4 & sensor's 4 channel readout @ 24Mhz )
2. Zoom jumping out.
I had this problem since bought the camera. Already described it here. When I magnify to x5, it jumps out to x1 in most of the cases, so it's truly hard to enable crop rec module and start recording in it.
Guys, maybe you know why is it happening?
I believe it's the same as problem #1 see answer above ,
plus I'll add a remember here about cleaning up liveview problems with simply pressing the play button twice (2 times)
Once to view a image (h264 or Cr2) press button once more to exit in to 3x3 (FHD) then re-enter crop_rec
no need to restart the camera .
So to recap , shutter in crop_rec needs to be 1/48th seconds ,
No exception's period .
Set 3x3 FHD to 1/60th & in the canon menu set 1080p to 29.97 fps , if you want 24p in 3x3 just enabled "frame override" and set it 24 from 30 .
By side that why would you want to change shutter from 180 degrees @ 24p ?