10 resources limit in SuperBoxSelect TV?

I’m using SuperBoxSelect to select a numer of resources to show on a page. After selecting ten resources in the select box I unable to select any further resources. When clicking the arrows a pagination thing saying “page 1 of 4” quickly flickers and then disappears. I’ve set the limit in the TV to 1000 just in case but that doesn’t help.

MODX 2.7.2
SuperBoxSelect 2.3.5