Mozo has been added to repos, works for editing the brisk menu, so is there any reason to fix menulibre?

I have experienced this after next boot when trying out compiz with mate, but I did not run the command. The panel just fixed itself after a while. Perhaps by opening Firefox.

I can reproduce this with updated Solus Mate on my laptop.

I can't reproduce this with latest Solus MATE. I was able to open images with Eye of Mate, set as desktop background, and the background is still present after reboot.
I tested with images in my pictures folder, and one in .local/share/, the wallpaper remains after reboot just fine.

Brightness slider in applet works as expected for me with Solus Mate. I can't reproduce any freezing/slowing by changing brightness.
Function keys work fine for changing brightness as well.