Why won't Foliage Tool show checkbox and is unable to paint/place instane?

Hello everyone,

When using the foliage tool I can no longer check/uncheck the box in the foliage library thumbnail. Nor can place any instance or paint any instance on the scene.

I can effectively not use the tool. Any answers to this issue? I’m running a project in 5.5.4.

Thank you for your time and help.