Hi. I think i have found a bug.
It seems Piwik 2.0.3 does not show pages without titles in the UI at all. They do not show up in the Piwik UI anywhere that i could find (overview, visitor log, pages, etc). If you give the pages a title, they show up like normal.
It does however seem like they get recorded to the database (in the piwik_log_action table).
As far as i remember, they used to show up in the UI in earlier versions, so this might be a new problem. Keywords: no title
this should work fine in modern Piwik we fixed it few months back