Taxonomy return bool(false)

Hi
When I installed the plugin it worked without a problem. I have a taxonomy field showing the categories in a select on a page. I saved a couple of pages and everything was fine.

The next morning when I made a new page the select was empty. The only output from the field was bool(false). The pages also lost their parent and/or template. I did no coding, didn’t install any other plugins.

Any ideas?

Help appreciated!

/L

https://wordpress.org/plugins/advanced-custom-fields/