I've had a bug for quite a while that randomly occurs after clicking play on the launcher, the java windows opens normally but when presented with the singleplayer/multiplayer etc. page no single click will register. It will only respond to double-clicks and treat it as a single one. Also when in a game after doubleclicking my way into it the mouse refuses to synchronise. This works with both trackpad and bluetooth mouse. I have had this error while using and not using a resource pack. Recently  however, I have been consistantly getting this bug rather than at random intervals. I don't really have an attachment as I don't know how to screen-record while showing inputs, could look into it if needed. Thanks!