What is your Shotcut version (see Help > About Shotcut)? Is it 32-bit?
Can you repeat the problem? If so, what are the steps?
(Please be specific and use the names as seen in Shotcut, preferably English. Include a screenshot or screen recording if you can. Also, you can attach logs from either View > Application Log or right-click a job and choose View Log.)
The problem seems to be in the characters set in the path of the LUTs files:
Yes, I can repeat the problem:
I load an image, any image, to the Timeline
Select the image in the Timeline
Add LUT 3D filter
Open ANY lut file from this path (notice the “é” in it):
there is NO change in the image colors.
If I copy the LUT folder to the following path:
It works perfectly!
I imagined it was the character set as I looked in the release notes and found there was a similar problem fixed (!) in Release 20.02.17:
_ * Fixed using the LUT (3D) filter with file with extended characters in its file path on Windows._
I reproduce this in the release build but not in my development build, which is probably why I claimed it was fixed. It is rare that this happens but sometimes does. That’s because my development system was running a newer version of FFmpeg. Since I have upgraded FFmpeg for the next version 21.10 (now in beta testing), this is fixed and working.