I encountered a problem on the path of a *.mlt file
Two things to understand, is it normal that the path in Shotcut is displayed with " / " and not with " \ "?
Also, opening an MLT as a clip, here is the display
and Shocut told me that the file was missing when launching the export of the video.
I solved the problem by renaming the file (_11 >>> _1b) and dragging and dropping in the playlist
I specify that I have no space in the path and in the name of my files