to maximize a view press shift+space instead of space. if you don't like this change you can change it using preferences/keys. on 2d mode when you click E to move you cannot see axis arrows. to see it click 2D button on the view use arrows on 3D mode (orth/back) and click 2D again to continue with 2D mode. do not forget to change meta files to visible if you use source control. on mavericks after you change a scene, if you crash when you debug and try to see locals; open your scene. close and reopen unity and try debug. if you open another scene after you opened your project unity crashes. Keep both 4.2 and 4.3. Be sure that all assets you use is compatible with 4.3.