“Nonce verification failed” when creating comments

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I have a simple blog. I’ve been a happy user of WP Fastest Cache for years (including the premium upgrade).

However, starting a few months ago, visitors to my blog have been getting the error “Nonce verification failed” when leaving a comment. It looks like this:

The error goes away immediately when I disable the WP Fastest Cache plugin.

Last month, I disabled the WP Fastest Cache plugin and immediately reactivated it. It appeared to fix the problem temporarily. However, after a few weeks the problem resurfaced.

Any suggestions? Thanks!!!!

 

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