What is your operating system?
What is your Shotcut version (see Help > About Shotcut)? Is it 32-bit?
21.08.29 Portable Apps version
I deleted it so can’t refer to Help.
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.)
I tried 2 projects of interlaced 704 x 480i .ts files - TV streams. None would start to render.
I then restored 21.03.21 and opened the project saved from 21.08.29.
It asked if I would like to repair the project? Yes.
The project rendered fine.