Let me first describe the issue I see on my C1 with 2195 (indeed that happened with the -1 release, but it is also 100% repeatable with 2195)

1. I am on the TV input.
2. I upload a 3DLUT and everything looks fine.
3. Interesting to note that when I change a TV channel, a black full screen appears for a little while.
4. But, when I power cycle and I return on the TV previous input, image has many pixel noise in near black areas. Interesting to note that when I change a TV channel, a gray full screen appears for a little while.

I have switched to an older CS release (2061). I have repeated 1 and 2 and verified 3, and when I run 4, no pixel noise, and black screen at channel change.

Note: a way to fix the issue (till the power cycle) is to switch to a Mode without a custom LUT. If before power cycling the TV mode is on a mode without custom LUT everything works fine. I have tried enabling/disabling fast start up in LG GUI, but I cannot see any dependency from that.
I have also tried with my C2, with no issues (i.e. the issue is specific to C1)
Another interesting info: If (with 2195), after having recovered with 2061, I try to download a LUT, it says (as expected) that my C1 does not support that, and, what described in 4 occurs.

If this is correct, it is your last request for the changes made that caused this...
We'll look into it.

Steve

I've sent an email, as we cannot see anything that would cause an issue like that - the fact the Upload works kinda points a finger at the LG itself.
But, the email has some tests we need you to perform to see if we can isolate anything.
Respond via email for now, and we can post the final results here when known.

Steve

With Enrico's help, the issue has found, and fixed.

Steve