Can you find out any information about the web server that your site is hosted on? For example, is the site hosted on managed WordPress hosting? We can even check a few things about the site if you can post the URL of the website here.
I removed your link to the PHP info page. You really don’t want that information to be public.
Can you check with anyone that said they got a “form data could not be applied to any valid registraiton” error to see about how long time wise they were on the registration form page? The reason I ask is because the form is a tad bit longer than the average registration form, and if some form submissions work OK, but others do not, what could be happening is the session expired before they finished filling out the form.
You can prevent the above by extending the session time to 90 minutes or even 120 minutes. This is the code you add to your website to get that done:
You can add the above to a functions plugin or into your WordPress theme’s functions.php file.
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Support forum for Event Espresso 3 and Event Espresso 4.