What is your Shotcut version (see Help > About Shotcut)?
23.07.29
Can you repeat the problem? If so, what are the steps?
Clips-only project.
Some filters are not available in my project anymore for selection. In some of the clips the filters are still there but I cannot apply them to new clips.
Example: “Speed: Forward only”
In new project, it is available, but I have to enable it in the existing project.
Time filters are only available in projects created since version 21.05. It intentionally does not automatically update old projects. I just created a clip-only project in version 22.12. Then, I opened it in version 23.07, and I can add time filters. I did find one sequence that reproduces it. Is the same for you?
Open a timeline project
Open the clip-only project
Filters > + > Time is empty
If I restart Shotcut and open the clip-only project the time filters do appear.
I just found another reproduction that I run into a lot more often:
open timeline project
open a video file
Filters > + > Time is empty
I fixed for the next version the things I reproduced above.
Just to be clear, maybe it was unclear: I cannot activate the filters anymore into my project, even right after restarting Windows and Shotcut. Is there any way to solve it with a workaround?