Kstars 3.5.9 stable (from repository)
Manjaro 21.3.5

I'm about at my wit's end trying to get the mosaic tool to work. I've followed the sparse instructions here and I can't press the button! I've loaded a CCD sequence, chosen a target (without spaces in the name), disabled all the steps I don't need, and it should be ready to open, right? Well I can't press the button. It's greyed out and I can't open the tool at all.

I had to install GSC to make the CCD simulator work, and now I have stars and a solve, so the telescope simulator is pointed in the right direction, coordinates are solved, but it still won't let me open the tool. I'm about to throw this thing out the window.