I tested on another site with Ver 6.1.6 and it worked with no error. I tried it on another and it failed.
The sites it is failing on had the plugin WP Mail SMTP
After deactivating and the reactivating the WP Mail SMTP plugin the form seems to be working now. Not sure why.
still having issues with this since the update. Something needs to be fixed. It works then stops working. Evwrytime I try something it seems to fix it but then soon after it stops working again.
Still waiting for a developer response to this issue.
It seems like page caching is having an issue with forms being blocked.
If I turn off page caching for pages that have the forms the issue seems to resolve.
Using WP Optimize but that version has not been updated in awhile and CF7 plugin has been so something with your plugin is causing the issue.
Looks like the issue is with the honeypot field in the plugin CF7 Apps. Not this plugin.
For info see this thread.
https://wordpress.org/support/topic/conflict-with-contact-form-7-45/page/2/#post-18920596
