I'm trying to add a recommender widget to provide additional recommended articles based on the person's history. I added the widget but nothing appears. I'm unsure how to resolve.
When editing the page layout and adding the widget, there is a small gear icon labeled 'Configure' in the upper right of the widget's box where you can configure options for the widget. Once you have it configured, you might need to give the Content Recommendation Calculation job time to run (so ensure you have your job scheduler configured).
Two other things to check:
Go to Administration > Jobs > type "content recommendation" to search > and see if the job is scheduled to run:
Also, go to Administration > Jobs > Jobs > Content Recommendation Calculation to ensure it's enabled and inspect its options, schedule, and any exceptions it might have thrown:
It's the same widget, just configured differently. When displayed as "Slider", it's that popup. The same widget also supports showing both recommended content and related content (either in slider or popup), but those are different data sources. When you see it working elsewhere on the site, it it showing related or recommended? If it is showing recommended elsewhere, it may just be that there are no recommendations for this particular combination of content and user?