Nidalee Bug (Not game-breaking, but annoying as hell.)
Nidalee currently has a bug where if you use your human form W (Bushwhack) and transform into a cougar without placing it, the mini-map becomes unusable.
Not game-breaking, but it's taken away quite a few opportunities for kills, and a few deaths to the jungler due to lack of being able to see what all is attacking them.
Ex: I am a Nid main, and I like to jump the second I press R, however I occasionally press W too fast, and I'll get the bushwhack skill. Then, I transform into a cougar, and try to click the mini-map to look top lane to check on it to see if I can roam, but find that clicking on the mini-map is useless, and does not move the screen, until I transform back into human form.