Multilingual Press Pro and Advanced Custom Fields compatibility

It depends. Many plugins are not multisite compatible. As far as I know, ACF is one of them. See How to update custom fields in a multi-site for the most common problem and the simple solution.

If you encounter this problem – overwritten fields from one site to another – ask the plugin author to implement the suggested fix. For WP SEO I have written a compatibility plugin. But that was an exception. I cannot do that for every plugin under the sun. ??

Thanks for the info Thomas, I’ll make some tests and will contact the plugin author if I encounter any problem

They can also always ask me directly per email. When there is anything I can do from my side that doesn’t create dependencies on other people’s code – I will do it. ??