A few days ago there was a change in how worker.mturk handled hit data. It broke a lot of scraper/search scripts. Most have since but updated to work again.

It looks like Hit Scraper was updated but certain features aren't working properly. I tested it out and if you click the reward amount HS it will accept the hit without a problem. It only causes an issue if you try to click the hit title to preview the hit.



You can access the preview if you delete ".json" from the url


There should be a way to fix the script so the links work normally, but I'm not much of a scripter and I don't use HS personally. Hopefully it will be updated soon.

Another script that does much the same thing and is working properly right now is here: https://greasyfork.org/en/scripts/36368-hit-forker

You could also try out the chrome extension MTurk Suite: https://chrome.google.com/webstore/detail/mturk-suite/iglbakfobmoijpbigmlfklckogbefnlf?hl=en-US
That contains several useful scripts, including Hit Finder which is another scraper.