Scrapebox Harvesting 0 URL's?

This has been happening to me since last night. I scraped a bunch of proxies, checked them using Scrapebox, kept all the Google pass ones... and when I go to Harvest, I get absolutely ZERO URL's. So I unchecked multithreaded harvester -- and apparently all the proxies are blocked? :S How is this possible if I used Scrapebox to check for Google pass proxies in the first place?