There's an issue with Google's App Engine that is causing issues with gScholar. If you are seeing false policy violations pop up or you are being prompted to enter a captcha, this is the reason why.
Our developers have notified Google and the issue should be resolved soon.
You can view the status of Google's App Engine at https://code.google.com/status/appengine
UPDATE: The issues with App Engine should now be resolved. Please contact firstname.lastname@example.org if you are seeing any other errors with gScholar.