I didn't find any issues.
If you find any issues you can check this.
If you are scraping a engine especially Google and you are not getting any results its due to some reasons.
The terms you are scraping simply do not have any result to return
Otherwise your proxies are blocked or some other error is happening.
The easiest way to check this is go to the settings menu, Uncheck "use multi threaded harvester".
Scrapebox will display each query, the proxy used and the result including any error message.