The Effectus Anti-Lag main coupled with the Shaz/Effectus comp patch causes the mouse not to take "new" commands the moment one command has been passed and not completed yet.
For instance if you click to go to the top/right then immediately change your mind and click elsewhere, the mouse won't take your second command and you'll have to wait that your character reaches the top/right first.
Removing the 2 aforementioned scripts does fix this strange behavior. Or maybe it was intended to be this way?
I redid mine and can confirm that solely removing Effectus Anti-Lag main and Shaz/Effectus comp patch does fix the bug.
However I do not have any Victor Sant Diagonal movement script.
I did check for the line return if !movable? || $game_map.interpreter.running? and it shows up in some additional scripts: Michael 8D movement
Unfortunately this one is already above Shaz Super Simple Mouse so I can't follow your recommendation.
EDIT: I also have the script "Mouse Diagonals" but according to its description it's not by Victor Sant. Putting this one above the mouse script doesn't fix the bug either.
Thanks for the specification @bgillisp .
Is there any chance for a fix? It does seem more natural to deal with a new command instantly rather than have to wait for the full path to be performed first...