Game Mechanics: Attack not working

[kaev]

It's probably the melee targeting bug that's been around for at least 3 years (I've been playing here 3 years). To workaround, clear or change your target and reacquire it. In my experience, using the 'toggle target and self' hotkey (defaults to TAB key) to reacquire the target will not clear the bug, you can TAB away from the target but need to left-click the target or /assist your MA or use the 'cycle through nearest NPCs' hotkey or really anything but 'toggle target and self' to reacquire.