According to Scrapebox support "if the IP is the same as your real IP it fails". I tested my private proxies using aliveproxy proxy checker and my IP is not visible according to that site. However, all proxies (my private ones as well as public ones all of which got marked as Google "PASSED" in Scrapebox) are failing the IP test in Scrapebox (Google: 200, IP Test: Failed IP test, Speed: IP visible). Any clues would be greatly appreciated. Scrapebox support will look into this further if others are experiencing this issue as well, so please reply here if you are with details. Thanks!