Someone else in the WP forum had a similar issue I am having, But his resolution doesn't work for me. It involves creating a taxonomy named "type". He and others in the thread discovered that there was a conflict with using that for the name of the taxonomy. The problem it caused was with looking at files in the WP media library. He deleted the taxonomy and media library started working again.
I am having a similar issue with the media library, in that a search will show nothing. As such, I am unable to select any file in the media library. And I also use Custom Post Types UI plugin, and I also had a taxonomy named "type". Unlike him, when I deleted the taxonomy, it did not resolve the issues. I've also deactivated every plugin and it still does it.
I have since recreated the a new taxonomy named listing_type. But I actually created "listing_type" before deleting "type" which is making me wonder if any taxonomy name with the letters "type" in them could cause a problem. Anyone know?
Other than that, I'm wondering if there is something "left over" in the database with "type" in it that I should hunt down and delete. I haven't seen anything.
Does anyone have any ideas that might help?