All events on Window Watcher are "unknown"

I have been having trouble with my Activity pane showing all activity as “unknown”, there’s only one category “Uncategorized” and both Top Window Titles and Top Applications only show “unknown”.

For this reason I went to the Raw data and try and understand the problem, and in the aw-watcher-window raw data pane all I saw was the following:

All the events are recorded as unknown, both the app and the title. Why could this be happening?