Hello Everyone, Since a few days something very strange has been happening to my computer I have a MBP 15" running 10.9.5 Never had any issue with it, but a couple of days ago on wake up finder started not working anymore. Specifically when it opens the window that would normally contains files is either empty or "transparent like" (see attached images) and if I move it around many times it creates a "drag" effect. Also on the sidebar half of my icons (i.e. Dropbox, Pictures have disappeared). I looked for this problem online with no luck at all. Also on the side, not sure if this matters or not, apparently the computer does not recognizes/does not see anymore the security certificates that I had installed (i.e. when I go to websites that required a certificate) now I get a message certificate is missing, although I did not do anything and it was working perfectly until a few days ago... Can anyone help me? Best, B.