Hello!
Like many people, I am also having a hard time removing adware as it keep recurring. I followed all the instructions at this link:
My current version of Malwarebytes is 3.3.1.2138. Scans show 4 threats. Turned off all sync, hit the reset sync button, closed the browser and have yet to restore sync because the files keep coming back. My home page is a trusted website, Google is the search engine used in the search bar and the only default search engine.
Something that strikes me as odd but may be normal is that at the end of the scan it'll report 4 threats found and 4 threats quarantined but after the reset it lists 0 threats quarantined.