Likely, I was tinting my rc.xml file to modify some shortcuts, and inadvertently I lost my root-menu, the one that opens when pressing the Win key.
I only have one occurrence of mb-jgtools main ipc in rc.xml. I suppose that this is the command to trigger the menu. Good that it exists, as second shortcut.
Please, where is Win key defined as trigger to root-menu?
I have to confess. I installed rofi to use it as an alternative to my root menu.
Thanks to your response I realized that by assigning the W-space shortcut (in rc.xml) to rofi.sh was a mistake, because the xcape program could’nt differentiate between W alone and W-space shortcuts.
Now I reverted to original Mabox, assigned another shortcut to rofi, and my Mabox is healthy and happy!