Missing cookies / contact form not working

Hi there,

I recieved an email from a reader of my blog telling me that the contact form hasn’t been working for days since she wasn’t able to comment on an article. She said she was told to activate all of her cookies which she already had.
So I tried also and of course my cookies are activated as well, but I get the same message.

Can somebody help me on this? I haven’t been recieving any comments and was wandering about it for days…
Thanks!

https://wordpress.org/plugins/contact-form-7/