Hi there,
I had this problem with Minion not showing on the screen.
It appears just after I changed screens and screen setup.
The application was launched and it appeared in the taskbar but no window with my addon.
I try to uninstall and reinstall. Same problem.
Finally I went through the xml file. I saw a fixed position for x and y . A huge number around 3900. Previously, I had a screen on the right of the main screen. I changed x and y to 0. Saved the file.
Launched minion and ... it worked