Hi,
I'm running kdenlive appimage 20.07.7 within KDE Plasma 5.18.5 and Qt 5.12.7 on an opensuse Leap 15.2. I wanted to modify a project of a reasonable size (rendered 2.7 GByte).
My intention was to introduce another small clip somewhere in the middle. So I tried to separate the timeline to get a gap where I could fit in the new clip. When I selected the section I wanted to shift right only a fraction of what I selected could be grouped. Can it be that there is simply not enough space reserved in a stash to accommodate all I had selected? If that's the case, can I increase the stash? I would be very grateful for any hints.

Thread can be closed. Problem solved.

what was the solution/issue?

I'm ashamed to tell you: The tracks were locked!