I ran into an issue with frm_add_entry_meta on a client's site. While testing this filter with code found in the Formidable Knowledgebase, it did not work as advertised. The issue sounds similar to yours where I was adding a value, but nothing would display in the view or on the form afterward. What I discovered is that there is no check to see if the entry meta already exists in the database. Running the filter over and over resulted in multiple repeated values for the single entry meta field on a single post. You have to use PHPMyAdmin and search the frm_item_metas table to see the multiple values. When displayed in a view or on a form, only the first value displays. Before using frm_add_entry_meta, include a condition that checks if the field already exists in the table. If it does, use frm_update_entry_meta instead.