Issue with HTML style selector in Layouts Visual Editor cell

Symptoms

This issue happens in some cases when using the Layouts Visual Editor cell.

The drop-down menu for the HTML style selector (for making the text a heading, paragraph, etc.) is not always displayed after clicking it.

Workaround

This problem is actually caused by the wrong z-index setting in the core CSS stylesheet and will be fixed in the next release.

The workaround is very simple:

1. Edit the editor.css file, located in the wp-content/plugins/layouts/inc/gui/editor/css/editor.css folder.
2. Add the following snippet at the bottom of the file:
   

   .toolset_page_dd_layouts_edit .mce-menu {
   z-index: 99999 !important;
   }

3. Save the file.