thank you for your help.
Thanks for writing in! First of all, make sure that you're fully updated by referring to our changelog for the latest release information (https://theme.co/changelog/)
I can't find anything in the latest changlog that concerns this problem. What exactly do you mean?
and also you can see the plugin versions from the following link (https://theme.co/apex/forum/t/troubleshooting-version-compatibility/1951).
Done. The plugin versions match.
There is no custom JS, neither global nor on this specific page
If you have an active child theme and if you have any child theme customizations, try switching to your parent X/Pro theme and test your issue.
I have a child theme, but no customizations are made there
Also try disabling your 3rd party plugins to see if you have any conflicts with other active plugins.
I did deactivate all plugins that do not belong to X, mainly two caching-plugins. No effect.
So there are still no error-messages for required fields. Can you tell me, where I can configure the error-message (exact message-text etc.)? Probably some changes there will solve the problem ..