Hi Chaucer!
Just to tell you that I have the same issue with another plugin that changes mouse behavior! It's "RiP_ImprovedMouseInput", you can find it here https://forums.rpgmakerweb.com/index.php?threads/improved-mouse-input-click-once...
Same thing: the mouse disappear when we move it and only reappear when we click somewhere.
I would love not to use this one, but it allows us to highlight MENU elements on mouse hover + to have just a Single-Click for every menu selection. It's a must and it works with my custom menu ! 0.0 Unfortunately, despite all their amazing changes, your plugin MightyMouse and MMC+ don't do that, so I wanted to apply this one, which work fine on blank project but is incompatible with yours.
Could you look at this issue, when looking at the QPlus one?
Sorry for all the trouble... But thank you a lot and best wishes for New Year! :)