A few years ago YSearch added a reCAPTCHA challenge test to make it more difficult for others to harvest the information in YSearch. That reCAPTCHA version is now shutdown. To get around what now may look like a barrier to using YSearch, simply click in the field that says "Type the text" and then click on the Show button.
For example, go to
https://www.wikitree.com/wiki/Roberts-7102
Next to Ysearch 97ZDB, click on [compare], then
Next to Ysearch 9WCMS, click on [compare], then
Click on the COMPARE button, then
Click in the "Type the text" field, then
Click on the "Show" button