I figured out the issue. It looks like it is collecting the next 10 events. If I am selected Category ABC and the next 10 events are under Category DEF then nothing shows. I expected the limit of x in the agenda view to show that limit whether there is no filter or with a filter. If I put in a larger limit, like 100, then I can filter by category. Unfortunately, the list, when the filter is off, is long and slow to bring up. Is there any change in the upcoming release to help this? It would be great if the agenda view gets the limit of x when doing a query from the database based on the filter selected.