I'm trying to create a view based on a Solr search index that includes a search form in a block. The view seems to be working based on the preview I see when editing the view. I have set "Exposed form in block: Yes" and "Exposed form style: Basic". The block is assigned to a region, and the block itself is rendered appropriately when the page is displayed. The problem I'm having is that the form is not displayed in the block. I see the block title, but no form and no button. What might I be missing here?