Line Missile Display Bug
I think patch 5.10 broke the line missile display if you use Quick Cast. I've found that if you mash an ability fast enough with the line missile display on, the line will display as the ability is casting and it won't go away until you left click. I've never had my combos choke up before, and the line missile display bug has happened to me on numerous (AP Kog'maw) occasions this patch. Anyone else encountered a problem with their line missile display choking up and refusing to disappear mid-combo?