When mentoring/spectating a player and leaving the game after it's finished using the "disconnect" button. When you join next game, you will see the mouse icon on the top of the screen at the place where the "disconnect" button were on the game you were mentoring/spectating. Needs a reconnect to the game if you want it to disappear. Fix please.
ive also had the cursor be left on an item socket after mentoring, that and after dcing via f6 after mentoring a game the cursor is definitely that of the mentors and not your own if that helps any