Two issues: 1) As I'm typing, the words seems to disappear and then re-appear, and then disappear again. I hope that makes sense. Also, the cursor seems to stutter a lot on Safari. This does not happen on Chrome or Firefox [ Pic attached to better illustrate ] 2) I don't know how to describe it, so see the picture! I did a clean install of ML after upgrading and have reset the PRAM. If I refresh, it's fine...until it happens again!! Any recommendations ?