Sure. I think you have a good base solution which is much better than any other plugin. The UI is easy and not cluttered. If you can get rid of those glitches in the editing screen and the saving bug, which deleted all my markers, I for sure give it another try. Because there are no other solutions…… that work. ??

All the websites have Advanced Custom Fields and WP Migrate DB Pro installed, that are the only two they have in common.

All use the current version of WordPress.

On one site, the described problem happened at the update to Contact Forms 3.7.2 (update was made with an older version of the plugin), other site I noticed the problem after the update to 3.7.1 (which is the version that is used on this site now).

I tried to update one site with the plugin version 3.7.1 to 3.7.2, locally, so see what’s happening, but the error problem didn’t occur. I guess, there could be a bug in the update to 3.7.1, but I’m not sure about that.

Themes are all mostly self-made. Some sites use Themes from Elmastudio. But none of the themes have (write) access to Contact Form 7.

Chosen another way and added a plugin for executing php inside a page. So my problem is solved. Thanks anyway Chip.

Of course. I kept that in mind. I want to add a query with a list of posts from custom types in my sub page. So it seems the only one way to set up a template for the subpage with the php snipped for the query. Or is there a way to include WordPress php queries/snippets inside the sub page without creating a template?

Uff, I’ve forgot there’s a plugin behind.
It’s the Improved Include Page Plugin.

Or do you have any other suggestions or solutions for this?