We were unable to reproduce the issue using WordPress 4.3.1, single site installation, and the Material theme.
Here are the steps we followed for troubleshooting:
- Install WordPress 4.3.1
- Install and activate Material theme 1.1.3
- Install and activate RPS Include Content 1.1.3
- Create a new page entitled “Content for inclusion”, which was assigned a Post ID of 7
- Edit the default “Sample Page” and add [rps-include post=”7″], then save.
So the issue you are experiencing does not seem to be with the current version of WordPress, nor the Material theme. We suspect one of the other plugins you have active may be manipulating the content after RPS Include Content has attempted to merge content from an included post.
The best way to verify this is to disable all plugins except RPS Include Content, and make certain it operates as expected. Then one-by-one, activate your other plugins, checking after each activation to see when the included content disappears.
Assuming we are correct, and you know which plugin is causing the issue, let us know and we’ll take a look at how it works. Perhaps we can code a workaround or put you in touch with the plugin author for a resolution.