Forgotten sprite bug doesnt hit me nearly as often as a few years back, maybe it is a hardware related effect, not sure. However what did hit me was ec not drawing mobs when running around at champ spawns, run a few steps, attack the first mob you see and a second later you are surrounded by 20 other casters that simply did not get drawn earlier, and no it wasnt upgrading spawn.
Also a whole series of client crashes that did happen when fighting changelings in stone form in twisted weald, did not happen on 2 other chars. Plus ofc completly black screen after death during client crash, so could not see anything in game window until rezzed.
Plus a bunch of minor annoyances one does not notice anymore, like that esc-key bug executing a macro.
I wish they would spend half a year to fix all those bugs , polish and rebalance the existing systems in game instead of making a new expansion that just will introduce a series of new problems that will never get fixed again.
Common, some issues are as old as stygian abyss, like for example mid-air corpse of stygian dragon that you cannot loot.