Hey @spmcnerd,
We have multiple security checks on the form (on submission), and this is one of them. Sometimes, these security checks may have false positives due to certain hosting configurations or heavy caching. In this case, the quickest solution is to disable these security checks is to add the following snippet
add_filter( 'mf_bypass_session_error', '__return_true' );
Add this one line as a snippet either via a snippets plugin or to your child theme’s functions.php file. This will bypass the session checks that our plugin performs. It’s for additional spam protections, there are still other security checks in place, so this shouldn’t cause any major issues.
In the meantime, I’ll see if we can determine what’s the issue with your specific form and improve the session check logic to avoid similar errors in the future. If we do, we’ll release an update shortly with the fix.
