I just worked on a laptop that Avast found 119 infections and Malwarebytes 6. After everything was quarantined/deleted, I still couldn't change the home page or default search provider in Safari and Chrome. I could see the unwanted search provider in the settings, but couldn't change or remove it. I eventually found two additions in the preference panes. One forced settings in Safari, the other in Chrome. After I removed these, everything went back to normal. I have used both of these products on many different Macs and they seem to always remove all infections. This is the first time something was left behind. Anyone else have a similar experience?