Google has been making life difficult for Web Content Studio. With lots of different data centres, plus differences in computer operating systems, browsers, etc, I have been forced to make a change to the way the spider works.
You can no longer enter a keyword phrase directly into the spider. You now need to use your own web browser to do the search. I have recorded a video to show the process.
Please make sure you have updated WCS to the latest version. You can do that via the Help menu. If the auto-update fails, you'll need to login to the download area and follow the instructions for a manual update.