Error: prove you're not a robot

[helsinkisisu]

Trying to login to the front-end with my account this morning, I am encountering:

There is an error
1. Prove you're not a robot

This is the first time I've seen this, and I get the same when trying a different login. I never had problems logging in previously, though I haven't logged in to the front-end for a while. I upgraded from 1.6.1.17 to 1.6.1.18 at the weekend, and was testing the installation of the 'Official GDPR compliance' module and the 'Cookies - GDPR Cookie law (block before consent)' module. The same result occurs when both modules are disabled.

Edited May 21, 2018 by helsinkisisu (see edit history)

[helsinkisisu]

Sort of no surprise there is no reply.  I discovered that this was being caused by the No CAPTCHA reCAPTCHA module (v2.0.1), which I replaced with Recaptcha Anywhere. No CAPTCHA reCAPTCHA was disabled but was causing the problem. Once deleted, login worked fine.

Edited May 25, 2018 by helsinkisisu (see edit history)